{"id":1721,"date":"2025-12-24T17:19:57","date_gmt":"2025-12-24T08:19:57","guid":{"rendered":"https:\/\/math-travel.com\/?p=1721"},"modified":"2026-02-11T16:55:10","modified_gmt":"2026-02-11T07:55:10","slug":"excenter","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-a\/excenter\/","title":{"rendered":"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f\uff1f\u6027\u8cea\u30fb\u610f\u5473\u30fb\u8a3c\u660e\u3092\u89e3\u8aac\uff01\u5185\u63a5\u5186\u3068\u306e\u9055\u3044\u3082\u89e3\u8aac"},"content":{"rendered":"\n<p>\u4e09\u89d2\u5f62\u306b\u306f<span class=\"yellow-hoso\">\u4e94\u5fc3\u3068\u547c\u3070\u308c\u308b5\u3064\u306e\u70b9<\/span>\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"561\" height=\"143\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u4e09\u89d2\u5f62\u306e\u4e94\u5fc3\u306e\u4e00\u89a7.png\" alt=\"\u4e09\u89d2\u5f62\u306e\u4e94\u5fc3\u306e\u4e00\u89a7\" class=\"wp-image-6883\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u4e09\u89d2\u5f62\u306e\u4e94\u5fc3\u306e\u4e00\u89a7.png 561w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u4e09\u89d2\u5f62\u306e\u4e94\u5fc3\u306e\u4e00\u89a7-300x76.png 300w\" sizes=\"(max-width: 561px) 100vw, 561px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4eca\u56de\u306f\u4e94\u5fc3\u306e\u4e2d\u3067\u3082<span class=\"hutoaka\">&#8220;\u508d\u5fc3&#8221;<\/span>\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f\u3001<span class=\"huto\">1\u3064\u306e\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u3068\u4ed6\u306e2\u3064\u306e\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u4ea4\u70b9<\/span>\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"450\" height=\"336\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\" class=\"wp-image-1758\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg 450w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228-300x224.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4e0a\u56f3\u304b\u3089\u5206\u304b\u308b\u3088\u3046\u306b\u3001\u4e09\u89d2\u5f62\u306b\u306f\u508d\u5fc3\u304c3\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u672c\u8a18\u4e8b\u3067\u306f<span class=\"hutoaka\">\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306b\u3064\u3044\u3066\u89e3\u8aac<\/span>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u508d\u5fc3\u306e\u5b9a\u7fa9\u3084\u6027\u8cea\u306a\u3069\u304c\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u305c\u3072\u6700\u5f8c\u307e\u3067\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"boushin\">\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"450\" height=\"336\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\" class=\"wp-image-1758\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg 450w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228-300x224.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f\u3001<span class=\"huto\">1\u3064\u306e\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u3068\u4ed6\u306e2\u3064\u306e\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u4ea4\u70b9<\/span>\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6587\u5b57\u3067\u306f\u30d4\u30f3\u3068\u3053\u306a\u3044\u3068\u601d\u3046\u306e\u3067\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u52d5\u753b\u3067\u89e3\u8aac\u304c\u898b\u305f\u3044\u65b9\u306f\u300c\u3068\u3042\u308b\u7537\u304c\u6388\u696d\u3092\u3057\u3066\u307f\u305f\u300d\u306e\u8449\u4e00\u3055\u3093\u304c\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/qV6_MPh71cE\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n\n\n\n<p>\u4e0b\u306e\u56f3\u306e\u3088\u3046\u306b\u4e09\u89d2\u5f62\u306e3\u8fba\u306e\u5ef6\u9577\u7dda\u3092\u63cf\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"415\" height=\"268\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/2-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f\" class=\"wp-image-1764\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/2-4.jpg 415w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/2-4-300x194.jpg 300w\" sizes=\"(max-width: 415px) 100vw, 415px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4e09\u89d2\u5f62\u306e\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u3068\u5411\u304b\u3044\u5408\u3046\u9802\u70b9\u306e\u4e8c\u7b49\u5206\u7dda\u304c1\u70b9\u3067\u4ea4\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u4ea4\u70b9\u304c\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"545\" height=\"268\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/10-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f\" class=\"wp-image-1757\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/10-4.jpg 545w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/10-4-300x148.jpg 300w\" sizes=\"(max-width: 545px) 100vw, 545px\" \/><\/figure>\n<\/div>\n\n\n<p>\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda2\u672c\u3068\u5411\u304b\u3044\u5408\u3046\u9802\u70b9\u306e\u4e8c\u7b49\u5206\u7dda\u304c\u304b\u306a\u3089\u305a1\u70b9\u3067\u4ea4\u308f\u308b\u3053\u3068\u306e\u8a3c\u660e\u306f\u3053\u3061\u3089\u3002<br>\u21d2<a href=\"#sonzai\">\u508d\u5fc3\u306e\u5b58\u5728\u8a3c\u660e<\/a>\u306f\u3053\u3061\u3089\u304b\u3089<\/p>\n\n\n\n<p>\u508d\u5fc3\u306f1\u3064\u306e\u4e09\u89d2\u5f62\u306b\u5bfe\u3057\u3066\uff13\u70b9\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"450\" height=\"336\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\" class=\"wp-image-1758\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg 450w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228-300x224.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"naishin\">\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u5185\u5fc3\u306e\u95a2\u4fc2<\/h2>\n\n\n\n<p>\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u306f<span class=\"huto\">\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u4ea4\u70b9<\/span>\u306a\u306e\u3067\u4e09\u89d2\u5f62\u306e\u5185\u5074\u306b\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u308c\u306b\u5bfe\u3057\u3066\u3001\u508d\u5fc3\u306f\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u4ea4\u70b9\u306a\u306e\u3067\u4e09\u89d2\u5f62\u306e\u5916\u5074\u306b\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"451\" height=\"285\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/3-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u5185\u5fc3\u306e\u95a2\u4fc2\" class=\"wp-image-1765\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/3-4.jpg 451w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/3-4-300x190.jpg 300w\" sizes=\"(max-width: 451px) 100vw, 451px\" \/><\/figure>\n<\/div>\n\n\n<p>\u5185\u5fc3\u3068\u508d\u5fc3\u3067\u306f\u307e\u3063\u305f\u304f\u9055\u3046\u70b9\u306b\u898b\u3048\u307e\u3059\u304c\u3001<span class=\"yellow-hoso\">\u5185\u5fc3\u3068\u540c\u3058\u3088\u3046\u306a\u6027\u8cea\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u5185\u5fc3\u3068\u508d\u5fc3\u306e\u3069\u3061\u3089\u3082<span class=\"hutoaka\">&#8220;\u89d2\u306e2\u7b49\u5206\u7dda\u306e\u4ea4\u70b9&#8221;<\/span>\u306a\u306e\u3067\u4f3c\u305f\u3088\u3046\u306a\u6027\u8cea\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u6027\u8cea\u306e\u3072\u3068\u3064\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5185\u5fc3\u306f\u4e09\u89d2\u5f62\u306e\u5185\u63a5\u5186\u306e\u4e2d\u5fc3\u306e\u70b9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\\(S\\)\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\\(r\\)\u3068\u3059\u308b\u3068<\/p>\n\n\n\n<p>\\[S=\\displaystyle \\frac {1}{2} r(a+b+c)\\]<\/p>\n\n\n\n<p>\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"566\" height=\"333\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/12-2.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u5185\u5fc3\u306e\u95a2\u4fc2\" class=\"wp-image-1759\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/12-2.jpg 566w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/12-2-300x177.jpg 300w\" sizes=\"(max-width: 566px) 100vw, 566px\" \/><\/figure>\n<\/div>\n\n\n<p>\u305d\u308c\u306b\u5bfe\u3057\u3066\u3001\u508d\u5fc3\u3092\u4e2d\u5fc3\u3068\u3057\u3066\u5468\u308a\u306b\u63a5\u3059\u308b\u534a\u5f84\\(r_{A}\\)\u306e\u5186\u3092\u63cf\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u5186\u3092<span class=\"hutoaka\">\u508d\u63a5\u5186<\/span>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"361\" height=\"364\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/13.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u5185\u5fc3\u306e\u95a2\u4fc2\" class=\"wp-image-1760\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/13.jpg 361w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/13-298x300.jpg 298w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/13-150x150.jpg 150w\" sizes=\"(max-width: 361px) 100vw, 361px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3053\u306e\u3068\u304d\u3001<\/p>\n\n\n\n<p>\\[\u25b3ABC=-\u25b3I_{A}BC+\u25b3I_{A} C A+\u25b3I_{A}AB\\]<\/p>\n\n\n\n<p>\u3068\u306a\u308a\u3001<\/p>\n\n\n\n<p>\\[\\displaystyle S=\\frac{1}{2} r_{A}(-a+b+c)\\]<\/p>\n\n\n\n<p>\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sonzai\">\u508d\u5fc3\u306e\u5b58\u5728\u8a3c\u660e<\/h2>\n\n\n\n<p><span class=\"huto\">\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u306e\u8a3c\u660e\u3092\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u300c\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u3068\u5bfe\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u304c1\u70b9\u3067\u4ea4\u308f\u308b\u3053\u3068\u300d\u304c\u3059\u3079\u3066\u306e\u4e09\u89d2\u5f62\u3067\u3044\u3048\u308b\u306e\u304b\u3092\u78ba\u304b\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><span class=\"hutoaka\">\u9577\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u8a3c\u660e\u304c\u6c17\u306b\u306a\u308b\u65b9\u306f\u4e0b\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"seishitu\">\u508d\u5fc3\u306e\u6027\u8cea<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"450\" height=\"336\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\" class=\"wp-image-1758\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg 450w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228-300x224.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p>1\u3064\u306e\u4e09\u89d2\u5f62\u306b\u5bfe\u3057\u3066\u3001\u508d\u5fc3\u3068\u508d\u63a5\u5186\u306f3\u500b\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u508d\u5fc3\u306f\u5185\u5fc3\u3068\u4f3c\u305f\u6027\u8cea\u3092\u3082\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3053\u3067<span class=\"hutoaka\">\u508d\u5fc3\u30fb\u5185\u5fc3\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u6027\u8cea\u3092 4\u3064\u7d39\u4ecb<\/span>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u3010\u6027\u8cea\u2460\u3011\u508d\u5fc3\u306f\u508d\u63a5\u5186\u306e\u4e2d\u5fc3\u3067\u3042\u308b<\/h3>\n\n\n\n<p>\u508d\u5fc3\u306f\u508d\u63a5\u5186\u306e\u4e2d\u5fc3\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2460-1024x768.png\" alt=\"\" class=\"wp-image-4913\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2460-1024x768.png 1024w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2460-300x225.png 300w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2460-768x576.png 768w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2460-1536x1152.png 1536w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2460-2048x1536.png 2048w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2460.png 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">\u3010\u6027\u8cea\u2461\u3011\u508d\u5fc3\u304b\u3089\u306e\u5782\u7dda\u306e\u9577\u3055\u3068\u508d\u63a5\u5186\u306e\u534a\u5f84\u306f\u7b49\u3057\u3044<\/h3>\n\n\n\n<p>\u25b3ABC\u306b\u304a\u3044\u3066\u3001\u508d\u5fc3\u304b\u3089\u306e\u5404\u8fba\u306b\u3072\u3044\u305f\u5782\u7dda\u306e\u9577\u3055\u3068\u508d\u63a5\u5186\u306e\u534a\u5f84\u306f\u7b49\u3057\u3044\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"417\" height=\"338\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2461.png\" alt=\"\u508d\u5fc3\u306e\u6027\u8cea\u2461\" class=\"wp-image-4914\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2461.png 417w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2461-300x243.png 300w\" sizes=\"(max-width: 417px) 100vw, 417px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">\u3010\u6027\u8cea\u2462\u3011\u25b3ABC\u306e\u5185\u5fc3I\u306f\u3001\u25b3ABC\u306e\u508d\u5fc3\u3092\u9802\u70b9\u3068\u3059\u308b\u4e09\u89d2\u5f62\u306e\u5782\u5fc3<\/h3>\n\n\n\n<p>3\u3064\u306e\u508d\u5fc3\u3092\\(I_{A},I_{B},I_{C}\\)\u3068\u3059\u308b\u3068\u3001\\(\\triangle ABC\\)\u306e\u5185\u5fc3I\u306f\\(\\triangle I_{A}I_{B}I_{C}\\)\u306e\u5782\u5fc3\u3067\u3042\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"436\" height=\"357\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2462.png\" alt=\"\u508d\u5fc3\u306e\u6027\u8cea\" class=\"wp-image-4911\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2462.png 436w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u508d\u5fc3\u306e\u6027\u8cea\u2462-300x246.png 300w\" sizes=\"(max-width: 436px) 100vw, 436px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">\u3010\u6027\u8cea\u2463\u3011\u508d\u5fc3\\(I_{A}\\)\u306f\u76f4\u7dda\\(AI\\)\u4e0a\u306b\u5b58\u5728\u3059\u308b<\/h3>\n\n\n\n<p>\u508d\u5fc3\u3082\u5185\u5fc3\u3082\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u4ea4\u70b9\u3067\u5b9a\u7fa9\u3055\u308c\u308b\u70b9\u306a\u306e\u3067\u3001\u508d\u5fc3\\(I_{A}\\)\u306f\u76f4\u7dda\\(AI\\)\u4e0a\u306b\u5b58\u5728\u3059\u308b<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"545\" height=\"268\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u6027\u8cea\uff14.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u6027\u8cea\uff14\" class=\"wp-image-4915\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u6027\u8cea\uff14.jpg 545w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u6027\u8cea\uff14-300x148.jpg 300w\" sizes=\"(max-width: 545px) 100vw, 545px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"kakikata\">\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u66f8\u304d\u65b9<\/h2>\n\n\n\n<p><span class=\"huto\">\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u66f8\u304d\u65b9\u3092\u56f3\u3092\u7528\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u5fc5\u8981\u306a\u306e\u306f\u3001<span class=\"yellow-hoso\">\u4e09\u89d2\u5f62\u3001\u7b46\u8a18\u7528\u5177\u3001\u30b3\u30f3\u30d1\u30b9<\/span>\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"507\" height=\"148\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u5185\u5fc3\u306e\u4f5c\u56f3\u306b\u5fc5\u8981\u306a\u3082\u306e.png\" alt=\"\u5185\u5fc3\u306e\u4f5c\u56f3\u306b\u5fc5\u8981\u306a\u3082\u306e\" class=\"wp-image-6882\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u5185\u5fc3\u306e\u4f5c\u56f3\u306b\u5fc5\u8981\u306a\u3082\u306e.png 507w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u5185\u5fc3\u306e\u4f5c\u56f3\u306b\u5fc5\u8981\u306a\u3082\u306e-300x88.png 300w\" sizes=\"(max-width: 507px) 100vw, 507px\" \/><\/figure>\n<\/div>\n\n\n<p>\u624b\u9806\u306f\u7c21\u5358\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4e09\u89d2\u5f62\u306e\u3069\u3053\u304b\u306e\u9802\u70b9\u306b\u30b3\u30f3\u30d1\u30b9\u306e\u91dd\u3092\u7f6e\u3044\u3066\u5f27\u3092\u63cf\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u3068\u304d\u8fba\u3068\u8fba\u306e\u5ef6\u9577\u7dda\u306e\uff12\u304b\u6240\u3067\u4ea4\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"340\" height=\"233\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/5-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u898b\u3064\u3051\u65b9\" class=\"wp-image-1767\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/5-4.jpg 340w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/5-4-300x206.jpg 300w\" sizes=\"(max-width: 340px) 100vw, 340px\" \/><\/figure>\n<\/div>\n\n\n<p>\u6b21\u306b\u3001\u3069\u3061\u3089\u304b\u306e\u4ea4\u70b9\u306b\u30b3\u30f3\u30d1\u30b9\u306e\u91dd\u3092\u7f6e\u304d\u306a\u304a\u3057\u3001\u5f27\u3092\u63cf\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"332\" height=\"237\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/6-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u898b\u3064\u3051\u65b9\" class=\"wp-image-1768\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/6-4.jpg 332w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/6-4-300x214.jpg 300w\" sizes=\"(max-width: 332px) 100vw, 332px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u304c\u3067\u304d\u305f\u3089\u3001\u3082\u3046\u7247\u65b9\u306e\u4ea4\u70b9\u306b\u30b3\u30f3\u30d1\u30b9\u3092\u7f6e\u304d\u306a\u304a\u3057\u3001\u3082\u3046\u4e00\u5ea6\u5f27\u3092\u63cf\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"351\" height=\"245\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/7-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u898b\u3064\u3051\u65b9\" class=\"wp-image-1769\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/7-4.jpg 351w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/7-4-300x209.jpg 300w\" sizes=\"(max-width: 351px) 100vw, 351px\" \/><\/figure>\n<\/div>\n\n\n<p>\uff12\u3064\u306e\u5f27\u306e\u4ea4\u70b9\u3068\u3001\u521d\u3081\u306b\u30b3\u30f3\u30d1\u30b9\u3092\u7f6e\u3044\u305f\u9802\u70b9\u3092\u7d50\u3093\u3060\u3082\u306e\u304c\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"474\" height=\"238\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/8-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u898b\u3064\u3051\u65b9\" class=\"wp-image-1770\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/8-4.jpg 474w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/8-4-300x151.jpg 300w\" sizes=\"(max-width: 474px) 100vw, 474px\" \/><\/figure>\n<\/div>\n\n\n<p>\u5225\u306e\u5916\u89d2\u3067\u3082\u540c\u69d8\u306e\u3053\u3068\u3092\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\uff12\u3064\u306e\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u304c\u4ea4\u308f\u3063\u305f\u3068\u3053\u308d\u304c\u508d\u5fc3\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"422\" height=\"247\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/9-4.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u306e\u898b\u3064\u3051\u65b9\" class=\"wp-image-1756\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/9-4.jpg 422w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/9-4-300x176.jpg 300w\" sizes=\"(max-width: 422px) 100vw, 422px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"vector\">\u508d\u5fc3\u306e\u4f4d\u7f6e\u30d9\u30af\u30c8\u30eb<\/h2>\n\n\n\n<p>3\u70b9\u306e\u508d\u5fc3\\(I_{a},I_{b},I_{c}\\)\u306e\u4f4d\u7f6e\u30d9\u30af\u30c8\u30eb\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u508d\u5fc3\u306e\u4f4d\u7f6e\u30d9\u30af\u30c8\u30eb\u300a\u8a3c\u660e\u300b<\/h3>\n\n\n\n<p>\u8fba \\(BC\\) \u306b\u95a2\u3057\u3066\u9802\u70b9\\(A\\)\u3068\u53cd\u8a0e\u5074\u306b\u3042\u308b\u508d\u5fc3\\(I_{a}\\left(\\vec{i_{a}}\\right)\\)\u306b\u3064\u3044\u3066\u8a3c\u660e\u3057\u307e\u3059\u3002<br>\uff08\u4ed6\u306e\u508d\u5fc3\u306e\u5834\u5408\u3082\u540c\u6a23)<\/p>\n\n\n\n<p>\\(I_{a}\\)\u306f\u89d2\\(A\\)\u306e2\u7b49\u5206\u7dda\u4e0a\u306b\u3042\u308b\u304b\u3089<\/p>\n\n\n\n<p>\\[\\displaystyle \\overrightarrow{AI_{a}}=s\\left(\\frac{1}{c} \\overrightarrow{\\mathrm{AB}}+\\frac{1}{b} \\overrightarrow{\\mathrm{AC}}\\right)(0&lt;s) \\]<\/p>\n\n\n\n<p>\u3068\u8868\u305b\u308b\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3067\u3001<\/p>\n\n\n\n<p>\\(\\mathrm{I}_{a}\\)\u306f\u89d2\\(C\\)\u306e\u5916\u89d2\u306e2\u7b49\u5206\u7dda\u4e0a\u306e\u70b9\u3067\u3082\u3042\u308b\u304b\u3089<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\displaystyle \\overrightarrow{AI_{a}}&amp;=&amp;\\overrightarrow{AC}+\\overrightarrow{CI_{a}}\\\\<br>\\displaystyle &amp;=&amp;\\overrightarrow{AC}+t\\left(\\frac{1}{a} \\overrightarrow{CB}+\\frac{1}{b} \\overrightarrow{AC}\\right) \\quad(t&gt;0)\\\\<br>\\displaystyle &amp;=&amp;\\overrightarrow{AC}+t\\left\\{\\frac{1}{a}(\\overrightarrow{AB}-\\overrightarrow{AC})+\\frac{1}{b} \\overrightarrow{AC}\\right\\}\\\\<br>\\displaystyle &amp;=&amp;\\frac{t}{a} \\overrightarrow{AB}+\\left(1-\\frac{t}{a}+\\frac{t}{b}\\right) \\overrightarrow{AC}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3068\u8868\u3059\u3053\u3068\u3082\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<p>\\(\\overrightarrow{\\mathrm{AB}} \\neq \\overrightarrow{0}, \\overrightarrow{\\mathrm{AC}} \\neq \\overrightarrow{0} \\)\u304b\u3064\\(\\overrightarrow{\\mathrm{AB}}\\)\u3068\\(\\overrightarrow{\\mathrm{AC}}\\)\u306f\u5e73\u884c\u3067\u306a\u3044\u306e\u3067,<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\displaystyle \\frac{s}{c}&amp;=&amp;\\frac{t}{a}\\\\<br>\\displaystyle \\frac{s}{b}&amp;=&amp;1-\\frac{t}{a}+\\frac{t}{b}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3092\u5f97\u308b\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3092\u89e3\u3044\u3066\u3001<\/p>\n\n\n\n<p>\\[\\displaystyle s=\\frac{b c}{-a+b+c}, \\quad t=\\frac{a b}{-a+b+c}\\]<\/p>\n\n\n\n<p>\u3088\u3063\u3066\u3001<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\displaystyle \\overrightarrow{\\mathrm{AI_{a}}}&amp;=&amp;\\frac{b}{-a+b+c} \\overrightarrow{\\mathrm{AB}}+\\frac{c}{-a+b+c} \\overrightarrow{\\mathrm{AC}}\\\\<br>\\displaystyle &amp;=&amp;\\frac{b}{-a+b+c}(\\vec{b}-\\vec{a})+\\frac{c}{-a+b+c}(\\vec{c}-\\vec{a})\\\\<br>\\displaystyle &amp;=&amp;\\frac{-b-c}{-a+b+c} \\vec{a}+\\frac{b}{-a+b+c} \\vec{b}+\\frac{c}{-a+b+c} \\vec{c}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\displaystyle \\vec{i_{a}}&amp;=&amp;\\vec{a}+\\overrightarrow{\\mathrm{AI_{a}}}\\\\<br>\\displaystyle &amp;=&amp;\\frac{-a \\vec{a}+b \\vec{b}+c \\vec{c}}{-a+b+c}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3088\u3063\u3066\u8a3c\u660e\u7d42\u4e86<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"matome\">\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3000\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u508d\u5fc3\u306e\u5b9a\u7fa9\u3084\u6027\u8cea\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"450\" height=\"336\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\" class=\"wp-image-1758\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228.jpg 450w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/11-4-e1629333303228-300x224.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p>\u21d2<a href=\"#seishitu\">\u508d\u5fc3\u306e\u6027\u8cea\u306b\u3064\u3044\u3066<\/a>\u306f\u3053\u3061\u3089<\/p>\n\n\n\n<p>\u508d\u5fc3\u306f\u306a\u304b\u306a\u304b\u554f\u984c\u306b\u51fa\u3066\u304d\u307e\u305b\u3093\u304c\u3001\u77e5\u3063\u3066\u304a\u304f\u3068\u5468\u308a\u3068\u5dee\u304c\u3064\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u508d\u5fc3\u306f\u4e94\u5fc3\u306e\u306a\u304b\u3067\u306f\u30de\u30a4\u30ca\u30fc\u306a\u70b9\u3067\u3059\u3002<\/p>\n\n\n\n<p><span class=\"hutoaka\">\u300c\u5185\u5fc3\u300d<\/span>\u3084<span class=\"hutoaka\">\u300c\u5916\u5fc3\u300d<\/span>\u306f\u91cd\u8981\u306a\u70b9\u306a\u306e\u3067\u5fc5\u305a\u78ba\u8a8d\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><span class=\"yellow-hoso\">\u508d\u5fc3\u4ee5\u5916\u306e\u4e94\u5fc3\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u307e\u3068\u3081\u307e\u3057\u305f<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e09\u89d2\u5f62\u306b\u306f\u4e94\u5fc3\u3068\u547c\u3070\u308c\u308b5\u3064\u306e\u70b9\u304c\u5b58\u5728\u3057\u307e\u3059\u3002 \u4eca\u56de\u306f\u4e94\u5fc3\u306e\u4e2d\u3067\u3082&#8220;\u508d\u5fc3&#8221;\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002 \u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f\u30011\u3064\u306e\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u3068\u4ed6\u306e2\u3064\u306e\u5916\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u4ea4\u70b9\u3092\u6307\u3057\u307e\u3059\u3002 \u4e0a\u56f3\u304b\u3089\u5206\u304b\u308b\u3088 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4918,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[29,223],"tags":[28,10,11],"class_list":["post-1721","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zukei","category-math-a","tag-28","tag-a","tag-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u4e09\u89d2\u5f62\u306e\u508d\u5fc3\u3068\u306f\uff1f\u6027\u8cea\u30fb\u610f\u5473\u30fb\u8a3c\u660e\u3092\u89e3\u8aac\uff01\u5185\u63a5\u5186\u3068\u306e\u9055\u3044\u3082\u89e3\u8aac<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/math-travel.jp\/math-a\/excenter\/\" \/>\n<meta property=\"og:locale\" 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