{"id":2452,"date":"2025-12-24T17:18:41","date_gmt":"2025-12-24T08:18:41","guid":{"rendered":"https:\/\/math-travel.com\/?p=2452"},"modified":"2026-02-11T16:27:41","modified_gmt":"2026-02-11T07:27:41","slug":"sankaku-menseki-sain","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-1\/sankaku-menseki-sain\/","title":{"rendered":"\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\uff08sin\uff09\u306e\u4f7f\u3044\u65b9\u306f\uff1f\u89d2\u5ea6\u304b\u3089\u9762\u7a4d\u3092\u6c42\u3081\u308b\u624b\u9806\u3068\u8a3c\u660e\u3092\u89e3\u8aac"},"content":{"rendered":"\n<div class=\"wp-block-group has-border -border02 is-style-bg_grid\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" width=\"354\" height=\"291\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/triangle.jpg\" alt=\"\u4e09\u89d2\u6bd4\" class=\"wp-image-17134\" style=\"width:304px;height:auto\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/triangle.jpg 354w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/triangle-300x247.jpg 300w\" sizes=\"(max-width: 354px) 100vw, 354px\" \/><\/figure>\n\n\n\n<div id=\"kv\">\n        <p>sin\u03b8\u3092\u7528\u3044\u3066\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u5c0e\u51fa\u3057\u307e\u3059\u3002<br>\n          \u5404\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u3092\u5165\u529b\u5f8c\u3001\u7b97\u51fa\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n      <\/div>\n      <div class=\"flx\">\n        <div class=\"input-conditions\">\n          <div class=\"number-item\">\n            <label>a:<\/label>\n            <input type=\"number\" name=\"a1\" class=\"a1\">\n          <\/div>\n          <div class=\"number-item\">\n            <label>b:<\/label>\n            <input type=\"number\" name=\"a2\" class=\"a2\">\n          <\/div>\n          <div class=\"number-item\">\n            <label>\u03b8:<\/label>\n            <input type=\"number\" name=\"a3\" class=\"a3\">\n            <span>\uff08\u5ea6\u6570\u3067\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\uff09<\/span>\n          <\/div>\n        <\/div>\n      <\/div>\n      <div class=\"output\">\n        <p>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u306e\u516c\u5f0f <span class=\"sp\"><br><\/span><span class=\"fraction\"><span class=\"numerator fraction-parts\">1<\/span><span class=\"denominator fraction-parts\">2<\/span><\/span>ab sin\u03b8\n          = <span class=\"fraction\"><span class=\"numerator fraction-parts\">1<\/span><span class=\"denominator fraction-parts\">2<\/span><\/span>\u00d7<span id=\"equation\"><\/span>\u3088\u308a\u3001<br>\n          <spna class=\"bold\"><span id=\"result\"><\/span>cm<sup>2<\/sup><\/spna>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n      <\/div>\n      <div class=\"output-error\">\n        <p>\u5165\u529b\u306f0\u4ee5\u5916\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n      <\/div>\n      <div class=\"btn\">\n        <input type=\"button\" value=\"\u7b97\u51fa\" id=\"cal-btn\">\n        <input type=\"button\" value=\"\u30ea\u30bb\u30c3\u30c8\" id=\"reset-btn\">\n      <\/div>\n<\/div><\/div>\n\n\n\n<p><span class=\"checkmark2 on-color\">\u6570\u5b66\u2160\u4e09\u89d2\u6bd4\u306e\u306a\u304b\u3067<span class=\"hutoaka\">\u300csin\u3092\u7528\u3044\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u300d<\/span>\u304c\u767b\u5834\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p class=\"is-style-bg_stripe\"><span class=\"huto\">\u300c\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u304c\u77e5\u308a\u305f\u3044\u300d<\/span><br><span class=\"huto\">\u300csin\u306e\u4f7f\u3044\u65b9\u304c\u30a4\u30de\u30a4\u30c1\u308f\u304b\u3089\u306a\u3044<\/span>\u300d<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi5-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u9ad8\u6821\u751f<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>sin\u3092\u4f7f\u3063\u305f\u9762\u7a4d\u516c\u5f0f\u3092\u6559\u3048\u3066\u6b32\u3057\u3044\u3067\u3059\u2026<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p>\u4e09\u89d2\u6bd4\u306b\u306f\u69d8\u3005\u306a\u516c\u5f0f\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4e0b\u56f3\u306e<span class=\"yellow-hoso\">sin\u3092\u4f7f\u3063\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u306f\u91cd\u8981\u306a\u516c\u5f0f\u306e1\u3064<\/span>\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f<\/span><\/div><div class=\"cap_box_content\">\n<p><img decoding=\"async\" width=\"446\" height=\"316\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/4-8.jpg\" alt=\"sin\u3092\u7528\u3044\u305f\u9762\u7a4d\u516c\u5f0f\"><\/p>\n\n\n\n<p>\u25b3ABC\u306b\u304a\u3044\u30662\u8fba\u306e\u9577\u3055\u3092\\(a, b\\) \u3068\u3059\u308b\u3068\u304d\u3001\u25b3ABC\u306e\u9762\u7a4d\\(S\\)\u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>S &amp;=&amp;\\frac{1}{2} b c \\sin A \\\\<br>&amp;=&amp;\\frac{1}{2} c a \\sin B \\\\<br>&amp;=&amp;\\frac{1}{2} a b \\sin C<br>\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n<p><span class=\"huto\">\u300c\u516c\u5f0f\u306f\u5206\u304b\u3063\u305f\u3051\u3069\u4f7f\u3044\u65b9\u304c\u30a4\u30de\u30a4\u30c1\u3067&#8230;\u300d<\/span><\/p>\n\n\n\n<p>\u3053\u3093\u306a\u65b9\u306e\u305f\u3081\u306b\u672c\u8a18\u4e8b\u3067\u306f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u306e\u4f7f\u3044\u65b9\u3084\u4f8b\u984c\u3092\u4ea4\u3048\u306a\u304c\u3089\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u57fa\u790e\u304b\u3089\u78ba\u8a8d\u3057\u3066\u3044\u304f\u306e\u3067\u5b89\u5fc3\u3057\u3066\u305c\u3072\u6700\u5f8c\u307e\u3067\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"menseki\">\u4e09\u89d2\u6bd4sin\u3067\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u308b<\/h2>\n\n\n\n<p>\u4e09\u89d2\u6bd4sin\u3092\u7528\u3044\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u306f<span class=\"huto\" style=\"text-decoration: underline;\">&#8220;\u4e09\u89d2\u5f62\u306e2\u8fba\u306e\u9577\u3055\u3068\u305d\u306e\u9593\u306e\u89d2\u306e\u5927\u304d\u3055&#8221;<\/span>\u304c\u5206\u304b\u3063\u3066\u308b\u3068\u304d\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f<\/span><\/div><div class=\"cap_box_content\">\n<p><img decoding=\"async\" width=\"446\" height=\"316\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/4-8.jpg\" alt=\"sin\u3092\u7528\u3044\u305f\u9762\u7a4d\u516c\u5f0f\"><\/p>\n\n\n\n<p>\u25b3ABC\u306b\u304a\u3044\u30662\u8fba\u306e\u9577\u3055\u3092\\(a, b\\) \u3068\u3059\u308b\u3068\u304d\u3001\u25b3ABC\u306e\u9762\u7a4d\\(S\\)\u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>S &amp;=&amp;\\frac{1}{2} b c \\sin A \\\\<br>&amp;=&amp;\\frac{1}{2} c a \\sin B \\\\<br>&amp;=&amp;\\frac{1}{2} a b \\sin C<br>\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"350\" height=\"234\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u4f8b\u984c\u2460-e1672758519745.png\" alt=\"\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u4f8b\u984c\u2460\" class=\"wp-image-10827\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u4f8b\u984c\u2460-e1672758519745.png 350w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u4f8b\u984c\u2460-e1672758519745-300x201.png 300w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4e0a\u306e\u3088\u3046\u306a\u4e09\u89d2\u5f62\u306e\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f0f\u3067\u9762\u7a4d\u3092\u6c42\u3081\u308b\u3002<\/p>\n\n\n\n<p>\\[\\displaystyle S=\\frac{1}{2} \\cdot 6 \\cdot 6 \\cdot sin60^\\circ\\]<\/p>\n\n\n\n<p>\u3053\u308c\u3092\u8a08\u7b97\u3057\u3066<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\displaystyle S&amp;=&amp;\\frac{1}{2} \\cdot 6 \\cdot 6 \\cdot sin60^\\circ\\\\<br>\\displaystyle &amp;=&amp;\\frac{1}{2} \\cdot 6 \\cdot 6 \\cdot \\frac{\\sqrt{3}}{2}\\\\<br>\\displaystyle &amp;=&amp;9 \\sqrt{3}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi7-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u9ad8\u6821\u751f<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>2\u3064\u306e\u8fba\u3067\u631f\u3093\u3067\u516c\u5f0f\u306b\u4ee3\u5165\u3059\u308b\u3060\u3051\u3067\u3059\u306d\uff01<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"syoumei\">\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u3000\u8a3c\u660e<\/h2>\n\n\n\n<p>\u516c\u5f0f\u3092\u899a\u3048\u3066\u304a\u304f\u306e\u3082\u5927\u5207\u3067\u3059\u304c\u3001\u306a\u305c\u3053\u306e\u516c\u5f0f\u304c\u6210\u308a\u7acb\u3064\u306e\u304b\u7406\u89e3\u3057\u3066\u304a\u304f\u3053\u3068\u3082\u540c\u3058\u304f\u3089\u3044\u5927\u5207\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4e09\u89d2\u6bd4sin\u3092\u7528\u3044\u305f\u9762\u7a4d\u516c\u5f0f\u306e\u8a3c\u660e\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<p>\u25b3ABC\u306b\u304a\u3044\u3066\u3001\u89d2C\u304b\u3089\u8fbaAB\u306b\u5782\u7dda\u3092\u5f15\u304d\u3001\u5782\u7dda\u3068\u8fbaAB\u306e\u4ea4\u70b9\u3092H\u3068\u3059\u308b\u3002<\/p>\n\n\n\n<p>\u3059\u308b\u3068\u25b3ACH\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"465\" height=\"327\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/3-10.jpg\" alt=\"sin\u3092\u7528\u3044\u308b\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u3000\u8a3c\u660e\" class=\"wp-image-2469\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/3-10.jpg 465w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/3-10-300x211.jpg 300w\" sizes=\"(max-width: 465px) 100vw, 465px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(\\displaystyle sin A=\\frac{CH}{AC}=\\frac{CH}{b}\\)<\/p>\n\n\n\n<p>\u306a\u306e\u3067\u3001<\/p>\n\n\n\n<p>\\(CH=b sin A\\)<\/p>\n\n\n\n<p>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u306f<span class=\"red-hoso\">\u300c\u5e95\u8fba\u00d7\u9ad8\u3055\u00f7\uff12\u300d<\/span>\u3067\u3057\u305f\u306d\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092S\u3068\u3059\u308b\u3068\u4ee5\u4e0b\u304c\u6210\u308a\u7acb\u3064\u3002<\/p>\n\n\n\n<p>\\(\\displaystyle S=\\frac{1}{2}bcsinA\\)<\/p>\n\n\n\n<p>\u3053\u308c\u306f\\(\\angle B\u3001\\angle C\\)\u306b\u304a\u3044\u3066\u3082\u540c\u3058\u3053\u3068\u304c\u8a00\u3048\u308b\u305f\u3081\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u304c\u6210\u308a\u7acb\u3064\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mondai\">sin\u3092\u7528\u3044\u308b\u9762\u7a4d\u516c\u5f0f\uff1c\u7df4\u7fd2\u554f\u984c\uff1e<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"574\" height=\"151\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u7121\u984c.jpg\" alt=\"sin\u3092\u7528\u3044\u308b\u9762\u7a4d\u516c\u5f0f\uff1c\u7df4\u7fd2\u554f\u984c\uff1e\" class=\"wp-image-1109\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u7121\u984c.jpg 574w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/04\/\u7121\u984c-300x79.jpg 300w\" sizes=\"(max-width: 574px) 100vw, 574px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4eca\u56de\u5b66\u3093\u3060\u9762\u7a4d\u516c\u5f0f\u3092\u7528\u3044\u3066\u7df4\u7fd2\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u2460<\/span><\/div><div class=\"cap_box_content\">\n<p>\u25b3ABC\u306b\u304a\u3044\u3066\u3001\\(AB=3, AC=5, \\angle A=60^\\circ\\)\u306e\u6642\u3001\u25b3ABC\u306e\u9762\u7a4d\u3092\u6c42\u3081\u3088\u3002<\/p>\n<\/div><\/div>\n\n\n\n<p><span class=\"oomozi\">\u89e3\u8aac<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"309\" height=\"349\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-11.jpg\" alt=\"\u7df4\u7fd2\u554f\u984c1\" class=\"wp-image-2476\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-11.jpg 309w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-11-266x300.jpg 266w\" sizes=\"(max-width: 309px) 100vw, 309px\" \/><\/figure>\n<\/div>\n\n\n<p>sin\u3092\u7528\u3044\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u3088\u308a\u3001<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\displaystyle S&amp;=&amp;\\frac{1}{2}bcsinA<br>\\displaystyle &amp;=&amp;\\frac{1}{2} \\times 5 \\times 3 \\times \\frac{\\sqrt{3}}{2}<br>\\displaystyle &amp;=&amp;\\frac{15\\sqrt{3}}{4}<br>\\end{eqnarray}<br>&nbsp;<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u2461<\/span><\/div><div class=\"cap_box_content\">\n<p>\u25b3ABC\u306b\u304a\u3044\u3066\\(AB=3, AC=6 \\)\u3068\u3057\u3066\u3001 \u25b3ABC\u306e\u9762\u7a4d\u304c\\(\\displaystyle \\frac{9}{2}\\)\u306e\u3068\u304d\\(\\theta\\)\u306e\u5024\u3092\u6c42\u3081\u3088\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001\\(90^\\circ &lt; \\theta &lt;180^\\circ\\)\u3068\u3059\u308b\u3002<\/p>\n<\/div><\/div>\n\n\n\n<p><span class=\"oomozi\">\u89e3\u8aac<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"457\" height=\"185\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-12.jpg\" alt=\"\u7df4\u7fd2\u554f\u984c2\" class=\"wp-image-2475\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-12.jpg 457w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-12-300x121.jpg 300w\" sizes=\"(max-width: 457px) 100vw, 457px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u306f\u9762\u7a4d\u304c\u3059\u3067\u306b\u5206\u304b\u3063\u3066\u3044\u308b\u30bf\u30a4\u30d7\u306e\u5fdc\u7528\u554f\u984c\u3067\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\displaystyle S&amp;=&amp;\\frac{1}{2}bcsinA\\\\<br>\\displaystyle \\frac{9}{2}&amp;=&amp;\\frac{1}{2} \\cdot 6 \\cdot 3 \\cdot sinA\\\\<br>\\displaystyle \\frac{9}{2}&amp;=&amp;9 \\cdot sinA<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3064\u307e\u308a\u3001<\/p>\n\n\n\n<p>\\[\\displaystyle sinA=\\frac{1}{2}\\]<\/p>\n\n\n\n<p>\u3068\u306a\u308a\u3001\\(90^\\circ &lt; \\theta &lt;180^\\circ\\)\u306a\u306e\u3067\u3001<\/p>\n\n\n\n<p>\\(\\theta =150^\\circ\\)\u3068\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"matome\">\u4e09\u89d2\u6bd4sin\u306e\u9762\u7a4d\u516c\u5f0f\u3000\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u6570\u5b66\u2160\u306e\u4e09\u89d2\u6bd4\u304b\u3089sin\u3092\u7528\u3044\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f<\/span><\/div><div class=\"cap_box_content\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"446\" height=\"316\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/4-8.jpg\" alt=\"sin\u3092\u7528\u3044\u305f\u9762\u7a4d\u516c\u5f0f\" class=\"wp-image-2470\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/4-8.jpg 446w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/4-8-300x213.jpg 300w\" sizes=\"(max-width: 446px) 100vw, 446px\" \/><\/figure>\n<\/div>\n\n\n<p>\u25b3ABC\u306b\u304a\u3044\u30662\u8fba\u306e\u9577\u3055\u3092\\(a, b\\) \u3068\u3059\u308b\u3068\u304d\u3001\u25b3ABC\u306e\u9762\u7a4d\\(S\\)\u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>S &amp;=&amp;\\frac{1}{2} b c \\sin A \\\\<br>&amp;=&amp;\\frac{1}{2} c a \\sin B \\\\<br>&amp;=&amp;\\frac{1}{2} a b \\sin C<br>\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u6700\u5f8c\u307e\u3067\u898b\u3066\u3044\u305f\u3060\u3044\u3066\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u307f\u3093\u306a\u306e\u52aa\u529b\u304c\u5831\u308f\u308c\u307e\u3059\u3088\u3046\u306b\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>sin\u03b8\u3092\u7528\u3044\u3066\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u5c0e\u51fa\u3057\u307e\u3059\u3002 \u5404\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u3092\u5165\u529b\u5f8c\u3001\u7b97\u51fa\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002 a: b: \u03b8: \uff08\u5ea6\u6570\u3067\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\uff09 \u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u306e\u516c\u5f0f 12ab sin\u03b8 = 12\u00d7\u3088\u308a\u3001 cm2 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2471,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[34,222],"tags":[33,37,10,11],"class_list":["post-2452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sankakuhi","category-math-1","tag-33","tag-37","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\u9762\u7a4d\u516c\u5f0f\uff08sin\uff09\u306e\u4f7f\u3044\u65b9\u306f\uff1f\u89d2\u5ea6\u304b\u3089\u9762\u7a4d\u3092\u6c42\u3081\u308b\u624b\u9806\u3068\u8a3c\u660e\u3092\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-1\/sankaku-menseki-sain\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\uff08sin\uff09\u306e\u4f7f\u3044\u65b9\u306f\uff1f\u89d2\u5ea6\u304b\u3089\u9762\u7a4d\u3092\u6c42\u3081\u308b\u624b\u9806\u3068\u8a3c\u660e\u3092\u89e3\u8aac\" \/>\n<meta property=\"og:description\" content=\"sin\u03b8\u3092\u7528\u3044\u3066\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u5c0e\u51fa\u3057\u307e\u3059\u3002 \u5404\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u3092\u5165\u529b\u5f8c\u3001\u7b97\u51fa\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002 a: b: \u03b8: \uff08\u5ea6\u6570\u3067\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\uff09 \u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u306e\u516c\u5f0f 12ab sin\u03b8 = 12\u00d7\u3088\u308a\u3001 cm2 [&hellip;]\" \/>\n<meta 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