{"id":2063,"date":"2025-12-24T17:19:15","date_gmt":"2025-12-24T08:19:15","guid":{"rendered":"https:\/\/math-travel.com\/?p=2063"},"modified":"2026-02-11T16:28:43","modified_gmt":"2026-02-11T07:28:43","slug":"circular-measure","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-2\/circular-measure\/","title":{"rendered":"\u5f27\u5ea6\u6cd5\uff08\u30e9\u30b8\u30a2\u30f3\uff09\u3068\u306f\uff1f\u5ea6\u6570\u6cd5\u3078\u306e\u5909\u63db\u65b9\u6cd5\u3084\u6247\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u3092\u3059\u3079\u3066\u89e3\u8aac"},"content":{"rendered":"\n
\u4eca\u56de\u89e3\u6c7a\u3059\u308b\u60a9\u307f<\/span><\/div>
\n

\u300c\u5f27\u5ea6\u6cd5\u3063\u3066\u306a\u306b\uff1f\u300d <\/p>\n\n\n\n

\u300c\u5ea6\u6570\u6cd5\u304b\u3089\u5f27\u5ea6\u6cd5\u306b\u5909\u63db\u3057\u305f\u3044\u300d<\/p>\n<\/div><\/div>\n\n\n

\"\"\u9ad8\u6821\u751f<\/span><\/div>
\n

\u3069\u3046\u3044\u3046\u306e\u304c\u5f27\u5ea6\u6cd5\u3067\u3059\u304b\uff1f<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u6570\u2161\u306e\u4e09\u89d2\u95a2\u6570\u3067\u306f\u5186\u306e\u4e2d\u5fc3\u89d2\u3092\\(180^\\circ\\)\u3084\\(360^\\circ\\)\u3068\u3044\u3063\u305f\u5ea6\u6570\u6cd5\u3067\u306f\u306a\u304f\u3001\\(\\pi\\),\\(2\\pi\\)\u306a\u3069\u5f27\u5ea6\u6cd5\u3067\u8868\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u4e09\u89d2\u95a2\u6570\u3067\u306f\u5f27\u5ea6\u6cd5\u3092\u7528\u3044\u308b\u3053\u3068\u304c\u4e3b\u6d41\u306a\u306e\u3067\u610f\u5473\u306f\u3057\u3063\u304b\u308a\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n\n\n\n

\u672c\u8a18\u4e8b\u3067\u306f\u5f27\u5ea6\u6cd5\u306e\u610f\u5473\u304a\u3088\u3073\u5ea6\u6570\u6cd5\u304b\u3089\u5f27\u5ea6\u6cd5\u3078\u306e\u5909\u63db\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n

\"\"\u30b7\u30fc\u30bf<\/span><\/div>
\n

\u6c17\u306b\u306a\u308b\u898b\u51fa\u3057\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u3001
\u305c\u3072\u6700\u5f8c\u307e\u3067\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u5f27\u5ea6\u6cd5\u3068\u306f\uff1f<\/h2>\n\n\n
\n
\"\u5f27\u5ea6\u6cd5\u3068\u306f\uff1f\"<\/figure>\n<\/div>\n\n\n


\u5f27\u5ea6\u6cd5\u3068\u3044\u3046\u306e\u306f\u3001\u540d\u524d\u306e\u901a\u308a\u201d\u5f27\u201d\u306b\u6ce8\u76ee\u3057\u3066\u89d2\u5ea6\u3092\u8868\u73fe\u3059\u308b\u65b9\u6cd5<\/span>\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n

\u5186\u306e\u534a\u5f84\u3068\u5f27\u306e\u9577\u3055\u304c\u7b49\u3057\u304f\u306a\u308b\u89d2\u5ea6\u30921rad\uff08\u30e9\u30b8\u30a2\u30f3\uff09\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u5f27\u5ea6\u6cd5\u3068\u306f\uff1f\"<\/figure>\n<\/div>\n\n\n

\u534a\u5f84\\(r\\)\u306e\u5186\u306b\u304a\u3044\u3066\u3001\u5186\u5468\u306e\u9577\u3055\u306f\\(2\\pi r\\)\u3068\u306a\u308a\u3001\u3053\u306e\u6642\u306e\u4e2d\u5fc3\u89d2\u3092\\(2\\pi\\)\u30e9\u30b8\u30a2\u30f3\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u5f27\u5ea6\u6cd5\u3068\u306f\uff1f\"<\/figure>\n<\/div>\n\n\n

\u534a\u5186\u306e\u5834\u5408\u306f\u3001\u5186\u5468\u306e\u9577\u3055\u304c\\(\\pi r\\)\u306a\u306e\u3067\u3001\u4e2d\u5fc3\u89d2\u306f\\(\\pi\\)\u30e9\u30b8\u30a2\u30f3\u3067\u3059\u3002<\/p>\n\n\n

\n
\"\u5f27\u5ea6\u6cd5\u3068\u306f\uff1f\"<\/figure>\n<\/div>\n\n\n

\u3064\u307e\u308a\u3001\\(360^\\circ=2\\pi\\),\\(180^\\circ=\\pi\\)<\/span>\u3067\u3059\u3002<\/p>\n\n\n\n

\u4ed6\u306e\u89d2\u5ea6\u3082\u5f27\u5ea6\u6cd5\u306b\u76f4\u3057\u305f\u306e\u3067\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n

\n
\"\u5f27\u5ea6\u6cd5\u3068\u306f\uff1f\"<\/figure>\n<\/div>\n\n\n

\u5f27\u5ea6\u6cd5\u3068\u5ea6\u6570\u6cd5\u306e\u5909\u63db<\/h2>\n\n\n\n

\u5f27\u5ea6\u6cd5\u3092\u5ea6\u6570\u6cd5\u306b\u5909\u63db\u3057\u305f\u308a\u3001\u9006\u306b\u5ea6\u6570\u6cd5\u304b\u3089\u5f27\u5ea6\u6cd5\u306b\u5909\u63db\u3057\u305f\u308a\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u30dd\u30a4\u30f3\u30c8\u306f\\(\\pi=180^\\circ\\)\u3067\u3042\u308b\u3053\u3068\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

\u5ea6\u6570\u6cd5\u304b\u3089\u5f27\u5ea6\u6cd5\u3078\u5909\u63db<\/h3>\n\n\n\n

\u307e\u305a\u306f\u5ea6\u6570\u6cd5\u304b\u3089\u5f27\u5ea6\u6cd5\u306b\u76f4\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n\n\n\n

\\(180^\\circ=\\pi\\)\u306a\u306e\u3067\u3001<\/p>\n\n\n\n

\\(180^\\circ\\)\u3092\\(\\pi\\)\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002<\/p>\n\n\n\n

\u3064\u307e\u308a\u3001\\(180^\\circ\\)\u3067\u5272\u3063\u3066\\(\\pi\\)\u3092\u639b\u3051\u305f\u3089\u5909\u63db\u5b8c\u6210\u3067\u3059\u3002<\/p>\n\n\n\n

\\begin{eqnarray}
90^\\circ &=& 90^\\circ \\div 180^\\circ \\times{\\pi}\\\\
\\displaystyle &=& 90^\\circ \\times \\frac{\\pi}{180^\\circ}\\\\
\\displaystyle &=& \\frac{\\pi}{2}
\\end{eqnarray}<\/p>\n\n\n\n

\u3053\u308c\u3067\u5909\u63db\u5b8c\u6210\u3067\u3059\u3002<\/p>\n\n\n\n

\u7df4\u7fd2\u554f\u984c\u3092\u6700\u5f8c\u306e\u7ae0\u3067\u7528\u610f\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u89e3\u3044\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n

\u5f27\u5ea6\u6cd5\u304b\u3089\u5ea6\u6570\u6cd5\u3078\u5909\u63db<\/h3>\n\n\n\n

\u6b21\u306f\u5f27\u5ea6\u6cd5\u304b\u3089\u5ea6\u6570\u6cd5\u3078\u5909\u63db\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\\(\\pi=180^\\circ\\)\u306a\u306e\u3067\u3001<\/p>\n\n\n\n

\\(\\pi\\)\u3092\\(180^\\circ\\)\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002<\/p>\n\n\n\n

\u3064\u307e\u308a\u3001\\(\\pi\\)\u306b\\(180^\\circ\\)\u3092\u4ee3\u5165\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle\\frac{\\pi}{3} &=& \\frac{180^\\circ}{3}\\\\
&=& 60^\\circ
\\end{eqnarray}<\/p>\n\n\n\n

\u3053\u308c\u3067\u5909\u63db\u5b8c\u6210\u3067\u3059\u3002<\/p>\n\n\n\n

\u3053\u3061\u3089\u3082\u7df4\u7fd2\u554f\u984c\u3092\u6700\u5f8c\u306e\u7ae0\u3067\u7528\u610f\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u89e3\u3044\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n

\u5f27\u5ea6\u6cd5\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<\/h2>\n\n\n
\n
\"\u5f27\u5ea6\u6cd5\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\"<\/figure>\n<\/div>\n\n\n


\u306a\u305c\u308f\u3056\u308f\u3056\u5f27\u5ea6\u6cd5\u3092\u4f7f\u3046\u306e\u304b\u3001\u5f27\u5ea6\u6cd5\u306e\u30e1\u30ea\u30c3\u30c8\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u30fb\u5f27\u5ea6\u6cd5\u306e\u30e1\u30ea\u30c3\u30c8\uff11\u3064\u76ee\u306f\u3001\u5f27\u306e\u9577\u3055\uff0c\u9762\u7a4d\u304c\u7c21\u5358\u306b\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u6b21\u306e\u7ae0\u300c\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f<\/a>\u300d\u3067\u89e3\u8aac\u3059\u308b\u304b\u3089\u5206\u304b\u308b\u3088\u3046\u306b\u3001\u5f27\u5ea6\u6cd5\u3082\u7528\u3044\u308b\u3068\u7c21\u5358\u306b\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u304c\u6c42\u3081\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f<\/span><\/div>
\n

\u534a\u5f84 \\(r\\),\u4e2d\u5fc3\u89d2 \\(\\theta[\\mathrm{rad}]\\) \u306e\u539f\u5f62\u306e\u5f27\u306e\u9577\u3055\u3092\\(l\\),\u9762\u7a4d\u3092\\(S\\)\u3068\u3059\u308b\u3068
\u5f27\u306e\u9577\u3055\\(l\\)\u3000\\(l=r \\theta\\)<\/p>\n\n\n\n

\u9762\u7a4d\\(S\\)\u3000\\(\\displaystyle S=\\frac{1}{2} r^{2} \\theta=\\frac{1}{2} r l\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f<\/h2>\n\n\n
\n
\"\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f\"<\/figure>\n<\/div>\n\n\n
\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f<\/span><\/div>
\n

\u534a\u5f84 \\(r\\),\u4e2d\u5fc3\u89d2 \\(\\theta[\\mathrm{rad}]\\) \u306e\u539f\u5f62\u306e\u5f27\u306e\u9577\u3055\u3092\\(l\\),\u9762\u7a4d\u3092\\(S\\)\u3068\u3059\u308b\u3068
\u5f27\u306e\u9577\u3055\\(l\\)\u3000\\(l=r \\theta\\)<\/p>\n\n\n\n

\u9762\u7a4d\\(S\\)\u3000\\(\\displaystyle S=\\frac{1}{2} r^{2} \\theta=\\frac{1}{2} r l\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u3064\u307e\u308a\u3001\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u306f\uff08\u534a\u5f84\uff09\u00d7\uff08\u4e2d\u5fc3\u89d2\uff09<\/span>\u3067\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f\"<\/figure>\n<\/div>\n\n\n

\u307e\u305f\u3001\u6247\u5f62\u306e\u9762\u7a4d\u306f\\(\\displaystyle \\frac{1}{2}\\)\u00d7\\(\uff08\u534a\u5f84\uff09^2\\)<\/span><\/p>\n\n\n\n

\u3082\u3057\u304f\u306f\\(\\displaystyle \\frac{1}{2}\\)\u00d7\uff08\u534a\u5f84\uff09\u00d7\uff08\u5f27\u306e\u9577\u3055\uff09<\/span>\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f\"<\/figure>\n<\/div>\n\n\n

\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f\u3000\uff1c\u8a3c\u660e\uff1e<\/h3>\n\n\n\n

\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f\u306e\u8a3c\u660e\u3092\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u8a3c\u660e\u304c\u5fc5\u8981\u306a\u3044\u65b9\u306f\u3001\u6b21\u306e\u7ae0\u3078\u9032\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/span><\/p>\n\n\n\n

\u3010\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u3011<\/p>\n\n\n\n

\u6247\u5f62\u306e\u5f27\u306e\u9577\u3055\u306f\u4e2d\u5fc3\u89d2\u306e\u5927\u304d\u3055\u306b\u6bd4\u4f8b\u3059\u308b\u3002<\/p>\n\n\n\n

\u4e2d\u5fc3\u89d2\u304c\uff12\u500d\u306b\u306a\u308c\u3070\u3001\u5f27\u306e\u9577\u3055\u3082\uff12\u500d\u306b\u306a\u308b\u3002<\/p>\n\n\n

\n
\"\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f\u3000\uff1c\u8a3c\u660e\uff1e\"<\/figure>\n<\/div>\n\n\n

\u534a\u5f84\\(r\\)\u306e\u5186\u5468\u306f\\(2\\pi r\\)\uff0c\u4e2d\u5fc3\u89d2\u306f\\(2\\pi\\)\u3060\u304b\u3089\u6bd4\u4f8b\u5f0f\u306f<\/p>\n\n\n\n

\\[l:2\\pi r=\\theta:2\\pi\\]<\/p>\n\n\n\n

\u3053\u308c\u3092\u8a08\u7b97\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\\[2l\\pi=2\\pi r \\theta\\]<\/p>\n\n\n\n

\u3088\u3063\u3066\u3001\\(l=r \\theta\\)\u3068\u306a\u308a\u8a3c\u660e\u7d42\u4e86\u3067\u3059\u3002<\/p>\n\n\n\n

\u3010\u6247\u5f62\u306e\u9762\u7a4d\u3011<\/p>\n\n\n\n

\u9762\u7a4d\u3082\u5f27\u306e\u9577\u3055\u3068\u540c\u69d8\u306b\u6bd4\u4f8b\u5f0f\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u5f27\u306e\u9577\u3055\u3068\u9762\u7a4d\u306e\u516c\u5f0f\u3000\uff1c\u8a3c\u660e\uff1e\"<\/figure>\n<\/div>\n\n\n

\u6247\u5f62\u306e\u9762\u7a4d\u3082\u4e2d\u5fc3\u89d2\u306e\u5927\u304d\u3055\u306b\u6bd4\u4f8b\u3059\u308b\u306e\u3067\uff0c\u534a\u5f84\\(r\\)\u306e\u5186\u306e\u9762\u7a4d\u306f\\(\\pi r^{2}\\)\uff0c\u4e2d\u5fc3\u89d2\\(2\\pi\\)\u306a\u306e\u3067<\/p>\n\n\n\n

\u6bd4\u4f8b\u5f0f\u3000\\(S:\\pi r^{2}=\\theta:2\\pi\\)<\/p>\n\n\n\n

\u3053\u308c\u3092\u8a08\u7b97\u3057\u3066\u3001<\/p>\n\n\n\n

\\[2\\pi S=\\pi r^{2} \\theta\\]<\/p>\n\n\n\n

\\[\\displaystyle S=\\frac{1}{2} r^{2} \\theta\\]<\/p>\n\n\n\n

\\(l=r \\theta\\)\u306a\u306e\u3067<\/p>\n\n\n\n

\\[\\displaystyle S=\\frac{1}{2} r l\\]<\/p>\n\n\n\n

\u3068\u306a\u308a\u3001\u8a3c\u660e\u7d42\u4e86\u3067\u3059\u3002<\/p>\n\n\n\n

\u5f27\u5ea6\u6cd5\uff1c\u7df4\u7fd2\u554f\u984c\uff1e<\/h2>\n\n\n
\n
\"\u5f27\u5ea6\u6cd5\uff1c\u7df4\u7fd2\u554f\u984c\uff1e\"<\/figure>\n<\/div>\n\n\n
\u7df4\u7fd2\u554f\u984c1<\/span><\/div>
\n

\u5ea6\u6570\u6cd5\u3067\u8868\u3057\u305f\u89d2\u5ea6\u3092\u5f27\u5ea6\u6cd5\u306b\u76f4\u3057\u306a\u3055\u3044\u3002<\/p>\n\n\n\n

\u554f\uff11\uff0e\\(90^\\circ\\)<\/p>\n\n\n\n

\u554f\uff12\uff0e\\(45^\\circ\\)<\/p>\n\n\n\n

\u554f\uff13\uff0e\\(240^\\circ\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u89e3\u7b54<\/span><\/p>\n\n\n\n

\u5ea6\u6570\u6cd5\u304b\u3089\u5f27\u5ea6\u6cd5\u306b\u76f4\u3059\u3068\u304d\u306f\u3001\u300c\\(180^\\circ\\)\u3067\u5272\u3063\u3066\\(\\pi\\)\u3092\u639b\u3051\u308b\u300d<\/span>\u3060\u3063\u305f\u306e\u3067\u3001<\/p>\n\n\n\n

\u300a\u554f\u984c\u2460\u300b<\/p>\n\n\n\n

\\begin{eqnarray}
90^\\circ &=& 90^\\circ \\div{180^\\circ}\\times{\\pi}\\\\
&=& \\displaystyle \\frac{\\pi}{2}
\\end{eqnarray}<\/p>\n\n\n\n

\u300a\u554f\u984c\u2461\u300b<\/p>\n\n\n\n

\\begin{eqnarray}
45^\\circ &=& 45^\\circ \\div{180^\\circ}\\times{\\pi}\\\\
&=& \\displaystyle \\frac{\\pi}{4}
\\end{eqnarray}<\/p>\n\n\n\n

\u300a\u554f\u984c\u2462\u300b<\/p>\n\n\n\n

\\begin{eqnarray}
240^\\circ &=& 240^\\circ \\div{180^\\circ}\\times{\\pi}\\\\
&=& \\displaystyle \\frac{4}{3} \\pi
\\end{eqnarray}<\/p>\n\n\n\n

\u7df4\u7fd2\u554f\u984c2<\/span><\/div>
\n

\u5f27\u5ea6\u6cd5\u3067\u8868\u3057\u305f\u89d2\u5ea6\u3092\u5ea6\u6570\u6cd5\u306b\u76f4\u3057\u306a\u3055\u3044\u3002<\/p>\n\n\n\n

\u554f\uff11\uff0e\\(\\displaystyle \\frac{\\pi}{4}\\)<\/p>\n\n\n\n

\u554f\uff12\uff0e\\(\\displaystyle \\frac{2}{3} \\pi\\)<\/p>\n\n\n\n

\u554f\uff13\uff0e\\(\\displaystyle \\frac{11}{6} \\pi\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u89e3\u7b54<\/span><\/p>\n\n\n\n

\u5f27\u5ea6\u6cd5\u304b\u3089\u5ea6\u6570\u6cd5\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001\\(\\pi\\)\u306b\\(180^\\circ\\)<\/span>\u3092\u4ee3\u5165\u3057\u307e\u3057\u305f\u306d\uff01<\/p>\n\n\n\n

\u300a\u554f\u984c\u2460\u300b<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle \\frac{\\pi}{4} &=& \\frac{180^\\circ}{4}\\\\
&=& 45^\\circ
\\end{eqnarray}<\/p>\n\n\n\n

\u300a\u554f\u984c\u2461\u300b<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle \\frac{2}{3} \\pi &=& \\frac{2}{3} \\times{180^\\circ}\\\\
&=& 120^\\circ
\\end{eqnarray}<\/p>\n\n\n\n

\u300a\u554f\u984c\u2462\u300b<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle \\frac{11}{6} \\pi &=& \\frac{11}{6} \\times{180^\\circ}\\\\
&=& 330^\\circ
\\end{eqnarray}<\/p>\n\n\n\n

\u5f27\u5ea6\u6cd5\u307e\u3068\u3081<\/h2>\n\n\n\n

\u4eca\u56de\u306f\u6570\u5b66\u2161\u306e\u4e09\u89d2\u95a2\u6570\u304b\u3089\u5f27\u5ea6\u6cd5\u306e\u610f\u5473\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\\(180^\\circ\\)\u304c\\(\\pi\\)\u306b\u7f6e\u304d\u63db\u308f\u3063\u305f\u3060\u3051\u306a\u306e\u3067\u3001\u96e3\u3057\u304f\u8003\u3048\u306a\u3044\u307b\u3046\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u3067\u306f\u3001\u3053\u3053\u307e\u3067\u8aad\u3093\u3067\u304f\u3060\u3055\u3063\u3066\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u307f\u3093\u306a\u306e\u52aa\u529b\u304c\u5831\u308f\u308c\u307e\u3059\u3088\u3046\u306b\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false},"author":1,"featured_media":2082,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[35,224],"tags":[36,14,11],"class_list":["post-2063","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sincos","category-math-2","tag-36","tag-b","tag-11"],"yoast_head":"\n\u5f27\u5ea6\u6cd5\uff08\u30e9\u30b8\u30a2\u30f3\uff09\u3068\u306f\uff1f\u5ea6\u6570\u6cd5\u3078\u306e\u5909\u63db\u65b9\u6cd5\u3084\u6247\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u3092\u3059\u3079\u3066\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-2\/circular-measure\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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