{"id":4825,"date":"2022-03-07T21:29:40","date_gmt":"2022-03-07T12:29:40","guid":{"rendered":"https:\/\/hatsudy.com\/jp\/?p=4825"},"modified":"2022-07-10T17:38:51","modified_gmt":"2022-07-10T08:38:51","slug":"trigonometric-functions3","status":"publish","type":"post","link":"https:\/\/hatsudy.com\/jp\/trigonometric-functions3.html","title":{"rendered":"\u4e09\u89d2\u6bd4\u3068\u56f3\u5f62\u306e\u9762\u7a4d\uff1a\u4e09\u89d2\u5f62\u30fb\u591a\u89d2\u5f62\u306e\u9762\u7a4d\u3084\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84"},"content":{"rendered":"\n<p>\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u56f3\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002sin\u03b8\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u4e09\u89d2\u5f62\u306e\u305f\u3066\u306e\u9577\u3055\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u306e\u3067\u3059\u3002\u306a\u304a\u4e09\u89d2\u6bd4\u306e\u5024\u3092\u51fa\u3059\u305f\u3081\u306b\u306f\u3001\u6b63\u5f26\u5b9a\u7406\u3084\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308c\u3070\u3001\u56db\u89d2\u5f62\u3084\u4e94\u89d2\u5f62\u306a\u3069\u3001\u591a\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u591a\u89d2\u5f62\u306e\u9762\u7a4d\u3067\u306f\u3001\u4e09\u89d2\u5f62\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u306a\u304a\u4e09\u89d2\u6bd4\u3068\u56f3\u5f62\u306e\u9762\u7a4d\u3067\u306f\u3001\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u5b66\u3073\u307e\u3059\u3002\u305f\u3060\u3001\u91cd\u8981\u3067\u306f\u306a\u3044\u516c\u5f0f\u306a\u306e\u3067\u899a\u3048\u306a\u304f\u3066\u3082\u3044\u3044\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u4e09\u89d2\u6bd4\u3068\u56f3\u5f62\u306e\u554f\u984c\u3067\u306f\u3001\u5186\u304c\u95a2\u308f\u308b\u554f\u984c\u3092\u51fa\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u4e09\u89d2\u5f62\u304c\u95a2\u308f\u308b\u5186\u306b\u306f\u5916\u63a5\u5186\u3068\u5185\u63a5\u5186\u304c\u3042\u308a\u3001\u3069\u306e\u3088\u3046\u306b\u534a\u5f84\u3092\u51fa\u305b\u3070\u3044\u3044\u306e\u304b\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e09\u89d2\u6bd4\u3067\u306f\u56f3\u5f62\u3068\u4e00\u7dd2\u306b\u554f\u984c\u3092\u51fa\u3055\u308c\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u3069\u306e\u3088\u3046\u306b\u8fba\u306e\u9577\u3055\u3084\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308c\u3070\u3044\u3044\u306e\u304b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>sin\u03b8\u3067\u4e09\u89d2\u5f62\u306e\u305f\u3066\u306e\u9577\u3055\u3068\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b<\/h2>\n<p>\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u516c\u5f0f\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg1.jpg\" alt=\"\" width=\"553\" height=\"257\" class=\"aligncenter size-full wp-image-4828\" \/><\/p>\n<p><span style=\"color: #0000ff;\">2\u8fba\u3068\u305d\u306e\u9593\u306b\u3042\u308b\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3001sin\u03b8\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span>\u305d\u308c\u3067\u306f\u3001\u306a\u305c\u3053\u306e\u516c\u5f0f\u304c\u6210\u308a\u7acb\u3064\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u3053\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u306f\u3001\u899a\u3048\u3066\u3082\u3044\u3044\u3057\u899a\u3048\u306a\u304f\u3066\u3082\u3044\u3044\u3067\u3059\u3002\u305f\u3068\u3048\u516c\u5f0f\u3092\u899a\u3048\u306a\u304b\u3063\u305f\u3068\u3057\u3066\u3082\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\\(a\u00d7sin\u03b8\\)\u306b\u3088\u3063\u3066\u3001\u4e09\u89d2\u5f62\u306e\u305f\u3066\u306e\u9577\u3055\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u51fa\u3059\u516c\u5f0f\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u9762\u7a4d = \u6a2a \u00d7 \u305f\u3066 \u00f7 2<\/li>\n<\/ul>\n<p>\u305d\u306e\u305f\u3081\u3001<span style=\"color: #ff0000;\">\u6a2a\u306e\u9577\u3055(\\(b\\))\u3068\u305f\u3066\u306e\u9577\u3055\uff08\\(a\u00d7sin\u03b8\\)\uff09\u3092\u304b\u3051\u305f\u5f8c\u30012\u3067\u308f\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg2.jpg\" alt=\"\" width=\"600\" height=\"168\" class=\"aligncenter size-full wp-image-4829\" \/><\/p>\n<p>3\u3064\u306e\u89d2\u304c\u3059\u3079\u3066\u92ed\u89d2\u306e\u4e09\u89d2\u5f62\u3067\u3042\u3063\u3066\u3082\u3001\u920d\u89d2\u3092\u3082\u3064\u4e09\u89d2\u5f62\u3067\u3042\u3063\u3066\u3082\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u306f\\(S=\\displaystyle\\frac{1}{2}absin\u03b8\\)\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u30fb\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b<\/strong><\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u306f\u3044\u304f\u3089\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg3.jpg\" alt=\"\" width=\"338\" height=\"231\" class=\"aligncenter size-full wp-image-4830\" \/><\/p>\n<p>\u3053\u306e\u4e09\u89d2\u5f62\u306e\u305f\u3066\u306e\u9577\u3055\u306f\\(2\u00d7sin45\u00b0=\\displaystyle\\frac{2}{\\sqrt{2}}\\)\u3067\u3059\u3002\u307e\u305f\u3001\u6a2a\u306e\u9577\u3055\u306f\\(3\\sqrt{2}\\)\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u9762\u7a4d\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(\\displaystyle\\frac{2}{\\sqrt{2}}\u00d73\\sqrt{2}\u00d7\\displaystyle\\frac{1}{2}=3\\)<\/li>\n<\/ul>\n<p>\u3053\u3046\u3057\u3066\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u591a\u89d2\u5f62\u306e\u9762\u7a4d\u306e\u8a08\u7b97\u65b9\u6cd5<\/h3>\n<p>\u6b21\u306b\u56db\u89d2\u5f62\u3084\u4e94\u89d2\u5f62\u306a\u3069\u3001\u591a\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u591a\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u3068\u304d\u3001\u65b9\u6cd5\u3068\u3057\u3066\u306f\u300c\u4e09\u89d2\u5f62\u3092\u5229\u7528\u3057\u3066\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u300d\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070AB\u3068DC\u304c\u5e73\u884c\u3068\u306a\u308b\u4ee5\u4e0b\u306e\u53f0\u5f62\u306b\u3064\u3044\u3066\u3001\u9762\u7a4d\u306f\u3044\u304f\u3089\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg5.jpg\" alt=\"\" width=\"400\" height=\"218\" class=\"aligncenter size-full wp-image-4831\" \/><\/p>\n<p>\u307e\u305a\u3001DC\u306e\u9577\u3055\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u4f59\u5f26\u5b9a\u7406\u3088\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(5^2=(3\\sqrt{2})^2+DC^2-2\u00d73\\sqrt{2}\u00d7DC\u00d7cos135\u00b0\\)<\/p>\n<p>\\(25=18+DC^2+6DC\\)<\/p>\n<p>\\(DC^2+6DC-7=0\\)<\/p>\n<p>\\((DC-1)(DC+7)=0\\)<\/p>\n<p>\u8fba\u306e\u9577\u3055\u3067\u3042\u308b\u305f\u3081\u3001\\(DC&gt;0\\)\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001DC=1\u3067\u3059\u3002\u6b21\u306b\u3001\u53f0\u5f62\u306e\u7e26\u306e\u9577\u3055\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u56f3\u3092\u4f5c\u308c\u3070\u3001\\(3\\sqrt{2}\u00d7sinA\\)\\(=3\\sqrt{2}\u00d7sin45\u00b0\\)\u306b\u3088\u3063\u3066\u305f\u3066\u306e\u9577\u3055\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg11.jpg\" alt=\"\" width=\"400\" height=\"192\" class=\"aligncenter size-full wp-image-4832\" \/><\/p>\n<p>\\(3\\sqrt{2}\u00d7sin45\u00b0=3\\)\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u53f0\u5f62\u306e\u9762\u7a4d\u3092\u51fa\u3059\u516c\u5f0f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\((1+7)\u00d73\u00d7\\displaystyle\\frac{1}{2}=12\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\u4e09\u89d2\u5f62\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u53f0\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u56db\u89d2\u5f62\u3084\u4e94\u89d2\u5f62\u3001\u516d\u89d2\u5f62\u306a\u3069\u3001\u591a\u89d2\u5f62\u306e\u9762\u7a4d\u306f\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3067\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b<\/h2>\n<p>\u306a\u304a\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3057\u3066\u56f3\u5f62\u306e\u9762\u7a4d\u3092\u51fa\u3059\u3068\u304d\u3001\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u7fd2\u3044\u307e\u3059\u3002\\(2s=a+b+c\\)\u3068\u3059\u308b\u3068\u304d\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\uff08S\uff09\u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg7.jpg\" alt=\"\" width=\"600\" height=\"168\" class=\"aligncenter size-full wp-image-4833\" \/><\/p>\n<p>\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u5229\u7528\u3059\u308c\u3070\u3001\u89d2\u5ea6\u304c\u308f\u304b\u3089\u306a\u304b\u3063\u305f\u3068\u3057\u3066\u3082\u30013\u3064\u306e\u8fba\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u9762\u7a4d\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u4f59\u5f26\u5b9a\u7406\u3092\u4f7f\u3044\u3001\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u7121\u8996\u3059\u308b<\/h3>\n<p>\u305f\u3060\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u306f\u8907\u96d1\u3067\u3059\u3002\u307e\u305f\u5229\u7528\u3059\u308b\u5834\u9762\u306f\u5c11\u306a\u304f\u3001\u3053\u306e\u516c\u5f0f\u3092\u899a\u3048\u308b\u610f\u5473\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3082\u3061\u308d\u3093\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u899a\u3048\u3066\u3082\u3044\u3044\u3067\u3059\u304c\u3001\u307b\u307c\u5f79\u306b\u7acb\u3061\u307e\u305b\u3093\u3002\u305d\u3053\u3067<span style=\"color: #0000ff;\">3\u8fba\u306e\u9577\u3055\u304c\u4e0e\u3048\u3089\u308c\u3066\u3044\u308b\u9762\u7a4d\u306e\u554f\u984c\u3067\u306f\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n<p>\u4f59\u5f26\u5b9a\u7406\u3067\u3042\u308c\u3070\u30013\u8fba\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066cos\u03b8\u306e\u5024\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305fcos\u03b8\u304c\u308f\u304b\u308c\u3070\u3001sin\u03b8\u306e\u5024\u3082\u308f\u304b\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u306f\u3044\u304f\u3089\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg10.jpg\" alt=\"\" width=\"267\" height=\"222\" class=\"aligncenter size-full wp-image-4834\" \/><\/p>\n<p>\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u5229\u7528\u3059\u308c\u3070\u3001\u7c21\u5358\u306b\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u524d\u8ff0\u306e\u901a\u308a\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u899a\u3048\u308b\u5fc5\u8981\u306f\u306a\u3044\u305f\u3081\u3001\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(6^2=5^2+4^2-2\u00d74\u00d75\u00d7cos\u03b8\\)<\/p>\n<p>\\(36=25+16-40cos\u03b8\\)<\/p>\n<p>\\(40cos\u03b8=5\\)<\/p>\n<p>\\(cos\u03b8=\\displaystyle\\frac{1}{8}\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001cos\u03b8\u306e\u5024\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg9.jpg\" alt=\"\" width=\"267\" height=\"222\" class=\"aligncenter size-full wp-image-4835\" \/><\/p>\n<p>\u6b21\u306bsin\u03b8\u306e\u5024\u3092\u51fa\u3057\u307e\u3059\u3002\\(sin^2\u03b8+cos^2\u03b8=1\\)\u3067\u3042\u308b\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(sin^2\u03b8+\\displaystyle\\frac{1}{64}=1\\)<\/p>\n<p>\\(sin^2\u03b8=\\displaystyle\\frac{63}{64}\\)<\/p>\n<p>\\(0\u00b0&lt;\u03b8&lt;180\u00b0\\)\u3067\u3042\u308b\u305f\u3081\u3001\\(sin\u03b8&gt;0\\)\u3002<\/p>\n<p>\\(sin\u03b8=\\displaystyle\\frac{3\\sqrt{7}}{8}\\)<\/p>\n<p>\u6b21\u306b\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\\(sin\u03b8=\\displaystyle\\frac{3\\sqrt{7}}{8}\\)\u3001\u6a2a\u306e\u9577\u3055\u306f5\u3067\u3042\u308b\u305f\u3081\u3001\u3053\u308c\u307e\u3067\u8aac\u660e\u3057\u305f\u77e5\u8b58\u3092\u5229\u7528\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{1}{2}\u00d75\u00d74\u00d7sin\u03b8\\)<\/p>\n<p>\\(10\u00d7\\displaystyle\\frac{3\\sqrt{7}}{8}\\)<\/p>\n<p>\\(=\\displaystyle\\frac{15\\sqrt{7}}{4}\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3092\u5229\u7528\u3057\u306a\u304f\u3066\u3082\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u4e09\u89d2\u5f62\u306e\u5185\u63a5\u5186\u306e\u9762\u7a4d\u3068\u534a\u5f84<\/h2>\n<p>\u306a\u304a\u56f3\u5f62\u306e\u554f\u984c\u3092\u89e3\u304f\u3068\u304d\u3001\u4e09\u89d2\u5f62\u306b\u5185\u63a5\u3059\u308b\u5186\u304c\u51fa\u984c\u3055\u308c\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u4e09\u89d2\u5f62\u306e\u5185\u5074\u306b\u63a5\u3059\u308b\u5186\u3092\u5185\u63a5\u5186\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg12.jpg\" alt=\"\" width=\"238\" height=\"170\" class=\"aligncenter size-full wp-image-4836\" \/><\/p>\n<p>\u5185\u63a5\u5186\u306e\u554f\u984c\u3067\u306f\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3057\u305f\u308a\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3057\u305f\u308a\u3057\u307e\u3059\u3002\u5185\u63a5\u5186\u306e\u9762\u7a4d\\(S\\)\u3092\u8a08\u7b97\u3059\u308b\u3068\u304d\u3001\u516c\u5f0f\u304c\u3042\u308a\u307e\u3059\u3002\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\\(r\\)\u3068\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u516c\u5f0f\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(S=\\displaystyle\\frac{1}{2}r(a+b+c)\\)<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg13.jpg\" alt=\"\" width=\"343\" height=\"286\" class=\"aligncenter size-full wp-image-4837\" \/><\/p>\n<p>\u305f\u3060\u3001\u3053\u306e\u516c\u5f0f\u306f\u899a\u3048\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u7406\u7531\u3068\u3057\u3066\u306f\u3001\u7c21\u5358\u306b\u516c\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4e09\u89d2\u5f62\u3092\u5206\u5272\u3057\u3066\u30013\u3064\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg14.jpg\" alt=\"\" width=\"343\" height=\"286\" class=\"aligncenter size-full wp-image-4838\" \/><\/p>\n<p>\u5186\u306e\u4e2d\u5fc3\u304b\u3089\u4e09\u89d2\u5f62\u306e\u5404\u8fba\u307e\u3067\u306e\u8ddd\u96e2\u306f\u7b49\u3057\u3044\u3067\u3059\u3002\u307e\u305f\u63a5\u7dda\u306b\u5bfe\u3057\u3066\u5186\u306e\u4e2d\u5fc3\u304b\u3089\u7dda\u3092\u5f15\u304f\u3068\u3001\u76f4\u89d2\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u3001<span style=\"color: #0000ff;\">\u305d\u308c\u305e\u308c\u306e\u4e09\u89d2\u5f62\u306b\u3064\u3044\u3066\u9762\u7a4d\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002<\/span>\u305d\u3046\u3059\u308b\u3068\u3001\u5148\u307b\u3069\u306e\u516c\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{1}{2}ar+\\displaystyle\\frac{1}{2}br+\\displaystyle\\frac{1}{2}cr\\)<\/p>\n<p>\\(=\\displaystyle\\frac{1}{2}r(a+b+c)\\)<\/p>\n<p>\u516c\u5f0f\u306e\u4f5c\u308a\u65b9\u3092\u7406\u89e3\u3057\u3066\u3044\u308c\u3070\u3001\u5148\u307b\u3069\u306e\u516c\u5f0f\u3092\u899a\u3048\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3>\u5185\u63a5\u5186\u306f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3001\u5916\u63a5\u5186\u306f\u6b63\u5f26\u5b9a\u7406\u3067\u534a\u5f84\u3092\u6c42\u3081\u308b<\/h3>\n<p>\u306a\u304a\u4e09\u89d2\u5f62\u306f\u5fc5\u305a\u5185\u63a5\u5186\u3068\u5916\u63a5\u5186\u3092\u3082\u3061\u307e\u3059\u3002\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3059\u308b\u3068\u304d\u3001\u5fc5\u305a\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002\u5148\u307b\u3069\u89e3\u8aac\u3057\u305f\u516c\u5f0f\u306b\u306f\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3067\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3059\u308b\u5834\u5408\u3001\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002\u6b63\u5f26\u5b9a\u7406\u306b\u306f\u3001\u516c\u5f0f\u306e\u4e2d\u306b\u5916\u63a5\u5186\u306e\u534a\u5f84\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u306b\u3064\u3044\u3066\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3068\u5916\u63a5\u5186\u306e\u534a\u5f84\u306f\u3044\u304f\u3089\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/ijhg15.jpg\" alt=\"\" width=\"344\" height=\"242\" class=\"aligncenter size-full wp-image-4839\" \/><\/p>\n<p>\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\u51fa\u3059\u305f\u3081\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{1}{2}\u00d73\u00d72\u00d7sin60\u00b0\\)<\/p>\n<p>\\(=3\u00d7\\displaystyle\\frac{\\sqrt{3}}{2}\\)<\/p>\n<p>\\(=\\displaystyle\\frac{3\\sqrt{3}}{2}\\)<\/p>\n<p>\u6b21\u306b\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\\(r\\)\u3068\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5f0f\u3092\u4f5c\u308c\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{3\\sqrt{3}}{2}=\\displaystyle\\frac{1}{2}\u00d72r+\\displaystyle\\frac{1}{2}\u00d73r+\\displaystyle\\frac{1}{2}\u00d7\\sqrt{7}r\\)<\/p>\n<p>\\(3\\sqrt{3}=2r+3r+\\sqrt{7}r\\)<\/p>\n<p>\\(3\\sqrt{3}=r(5+\\sqrt{7})\\)<\/p>\n<p>\\(r=\\displaystyle\\frac{3\\sqrt{3}}{5+\\sqrt{7}}\\)<\/p>\n<p>\u6709\u7406\u5316\u3059\u308b\u3068<\/p>\n<p>\\(r=\\displaystyle\\frac{3\\sqrt{3}(5-\\sqrt{7})}{(5+\\sqrt{7})(5-\\sqrt{7})}\\)<\/p>\n<p>\\(r=\\displaystyle\\frac{15\\sqrt{3}-3\\sqrt{21}}{18}\\)<\/p>\n<p>\\(r=\\displaystyle\\frac{5\\sqrt{3}-\\sqrt{21}}{6}\\)<\/p>\n<p>\u6b21\u306b\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u5148\u307b\u3069\u8ff0\u3079\u305f\u901a\u308a\u3001\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3059\u308b\u3068\u304d\u306f\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(\\displaystyle\\frac{\\sqrt{7}}{sin60\u00b0}=2R\\)<\/p>\n<p>\\(\\sqrt{7}\u00f7\\displaystyle\\frac{\\sqrt{3}}{2}=2R\\)<\/p>\n<p>\\(\\sqrt{7}\u00d7\\displaystyle\\frac{2}{\\sqrt{3}}=2R\\)<\/p>\n<p>\\(\\displaystyle\\frac{\\sqrt{7}}{\\sqrt{3}}=R\\)<\/p>\n<p>\u6709\u7406\u5316\u3059\u308b\u3068<\/p>\n<p>\\(R=\\displaystyle\\frac{\\sqrt{21}}{3}\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u8a08\u7b97\u3092\u3059\u308b\u3068\u304d\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3068\u5916\u63a5\u5186\u306e\u534a\u5f84\u3067\u306f\u5229\u7528\u3059\u308b\u516c\u5f0f\u304c\u7570\u306a\u308b\u3053\u3068\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3057\u3001\u56f3\u5f62\u306e\u9762\u7a4d\u3068\u5186\u306e\u534a\u5f84\u3092\u6c42\u3081\u308b<\/h2>\n<p>\u591a\u304f\u306e\u5834\u9762\u3067\u4e09\u89d2\u6bd4\u304c\u5229\u7528\u3055\u308c\u307e\u3059\u3002sin\u03b8\u3084cos\u03b8\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u4e09\u89d2\u5f62\u306e\u8fba\u306e\u9577\u3055\u3060\u3051\u3067\u306a\u304f\u3001\u56f3\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u89e3\u8aac\u3057\u305f\u516c\u5f0f\u3068\u3057\u3066\u306f\u3001\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u51fa\u3059\u516c\u5f0f\u3084\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\u51fa\u3059\u516c\u5f0f\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3001\u3053\u308c\u3089\u306e\u516c\u5f0f\u3092\u899a\u3048\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u3089\u306e\u516c\u5f0f\u306f\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u7d76\u5bfe\u306b\u899a\u3048\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u516c\u5f0f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u3053\u3067\u554f\u984c\u304c\u51fa\u3055\u308c\u305f\u3068\u304d\u3001\u8fba\u306e\u9577\u3055\u3084\u89d2\u5ea6\u3092\u5229\u7528\u3057\u3066\u9762\u7a4d\uff08\u307e\u305f\u306f\u5186\u306e\u534a\u5f84\uff09\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u307e\u305f\u8fba\u306e\u9577\u3055\u3084\u89d2\u5ea6\u304c\u308f\u304b\u3089\u306a\u3044\u5834\u5408\u3001\u6b63\u5f26\u5b9a\u7406\u3084\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3068\u3044\u3044\u3067\u3059\u3002<\/p>\n<p>\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3059\u308c\u3070\u3001\u4e09\u89d2\u5f62\u306e\u305f\u3066\u306e\u9577\u3055\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u305d\u3053\u304b\u3089\u767a\u5c55\u3055\u305b\u308c\u3070\u3001\u30d8\u30ed\u30f3\u306e\u516c\u5f0f\u306a\u3057\u306b\u9762\u7a4d\u3092\u8a08\u7b97\u3057\u305f\u308a\u3001\u5185\u63a5\u5186\u306e\u534a\u5f84\u3092\u5c0e\u304f\u3053\u3068\u304c\u3067\u304d\u305f\u308a\u3057\u307e\u3059\u3002\u3069\u306e\u3088\u3046\u306b\u3057\u3066\u516c\u5f0f\u3092\u4f5c\u308c\u3070\u3044\u3044\u306e\u304b\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u56f3\u5f62\u306e\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002sin\u03b8\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u4e09\u89d2\u5f62\u306e\u305f\u3066\u306e\u9577\u3055\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u9762\u7a4d\u3092\u8a08\u7b97\u3059\u308b\u306e\u3067\u3059\u3002\u306a\u304a\u4e09\u89d2\u6bd4\u306e\u5024\u3092\u51fa\u3059\u305f\u3081\u306b\u306f\u3001\u6b63\u5f26\u5b9a\u7406\u3084\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4826,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":{"0":"post-4825","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-h-math"},"_links":{"self":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4825","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/comments?post=4825"}],"version-history":[{"count":3,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4825\/revisions"}],"predecessor-version":[{"id":7942,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4825\/revisions\/7942"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media\/4826"}],"wp:attachment":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media?parent=4825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/categories?post=4825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/tags?post=4825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}