{"id":4815,"date":"2022-03-07T21:29:37","date_gmt":"2022-03-07T12:29:37","guid":{"rendered":"https:\/\/hatsudy.com\/jp\/?p=4815"},"modified":"2022-07-10T17:38:59","modified_gmt":"2022-07-10T08:38:59","slug":"law-of-sines","status":"publish","type":"post","link":"https:\/\/hatsudy.com\/jp\/law-of-sines.html","title":{"rendered":"\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\uff1a\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u3092\u6c42\u3081\u308b\u516c\u5f0f"},"content":{"rendered":"\n<p>\u4e09\u89d2\u6bd4\u3067\u5229\u7528\u3055\u308c\u308b\u516c\u5f0f\u3068\u3057\u3066\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u304c\u3042\u308a\u307e\u3059\u3002\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u8fba\u306e\u9577\u3055\uff08\u307e\u305f\u306f\u4e09\u89d2\u6bd4\u306e\u5024\uff09\u3092\u6c42\u3081\u3089\u308c\u308b\u516c\u5f0f\u304c\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u3067\u3059\u3002<\/p>\n<p>\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306f\u300c\u308f\u304b\u3089\u306a\u3044\u8fba\u306e\u9577\u3055\u3084\u89d2\u5ea6\u3092\u8a08\u7b97\u3067\u304d\u308b\u300d\u3068\u3044\u3046\u70b9\u3067\u306f\u540c\u3058\u3067\u3059\u3002\u305f\u3060\u3001\u4f7f\u7528\u3059\u308b\u5834\u9762\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3079\u304d\u8a08\u7b97\u304c\u3042\u308c\u3070\u3001\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3059\u308b\u3079\u304d\u5834\u9762\u3082\u3042\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e\u516c\u5f0f\u3092\u7406\u89e3\u3057\u305f\u5f8c\u3001\u4e09\u89d2\u5f62\u3067\u306e\u8fba\u3068\u89d2\u306e\u5927\u5c0f\u95a2\u4fc2\u3092\u5b66\u3079\u3070\u3001\u4f8b\u3048\u3070\u92ed\u89d2\u4e09\u89d2\u5f62\u306b\u306a\u308b\u6761\u4ef6\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u8fba\u306e\u9577\u3055\u3084\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u306e\u306f\u3001\u529b\u5b66\u3084\u571f\u6728\u306a\u3069\u591a\u304f\u306e\u5834\u9762\u3067\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306f\u91cd\u8981\u306a\u516c\u5f0f\u306e\u4e00\u3064\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u4e09\u89d2\u5f62\u306f\u5fc5\u305a\u5916\u63a5\u5186\u3092\u3082\u3064<\/h2>\n<p>\u307e\u305a\u3001\u4e09\u89d2\u5f62\u306e\u6027\u8cea\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u4e09\u89d2\u5f62\u306b\u306f\u591a\u304f\u306e\u6027\u8cea\u304c\u3042\u308a\u3001\u305d\u306e\u4e00\u3064\u304c\u5916\u63a5\u5186\u3092\u3082\u3064\u3053\u3068\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u3059\u3079\u3066\u306e\u4e09\u89d2\u5f62\u3067\u5916\u63a5\u5186\u3092\u63cf\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5916\u63a5\u5186\u3068\u306f\u3001\u4e09\u89d2\u5f62\u306e\u5916\u3067\u63a5\u3059\u308b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5186\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/reyuf2.jpg\" alt=\"\" width=\"143\" height=\"144\" class=\"aligncenter size-full wp-image-4816\" \/><\/p>\n<p>\u306a\u305c\u5916\u63a5\u5186\u3092\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3068\u3044\u3046\u3068\u3001\u6b63\u5f26\u5b9a\u7406\u3067\u5229\u7528\u3055\u308c\u308b\u304b\u3089\u3067\u3059\u3002\u306a\u304a\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306f\u8a3c\u660e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3082\u306e\u306e\u3001\u516c\u5f0f\u3092\u899a\u3048\u3066\u3057\u307e\u3046\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u6570\u5b66\u306b\u306f\u899a\u3048\u308b\u3079\u304d\u516c\u5f0f\u3068\u899a\u3048\u306a\u304f\u3066\u3082\u3044\u3044\u516c\u5f0f\u304c\u3042\u308a\u307e\u3059\u3002\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306f\u899a\u3048\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u516c\u5f0f\u3067\u3059\u3002<\/p>\n<h3>\u6b63\u5f26\u5b9a\u7406\u306b\u3088\u308a\u3001sin\u03b8\u3067\u8fba\u306e\u9577\u3055\u3084\u89d2\u5ea6\u3001\u5916\u63a5\u5186\u306e\u534a\u5f84\u304c\u308f\u304b\u308b<\/h3>\n<p>\u305d\u308c\u3067\u306f\u3001\u6b63\u5f26\u5b9a\u7406\u306e\u516c\u5f0f\u306f\u3069\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u6b63\u5f26\u5b9a\u7406\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8fba\u3068\u89d2\u5ea6\u3001\u534a\u5f84\uff08R\uff09\u3092\u3082\u3064\u4e09\u89d2\u5f62\u3068\u5916\u63a5\u5186\u3092\u8003\u3048\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/reyuf3.jpg\" alt=\"\" width=\"281\" height=\"284\" class=\"aligncenter size-full wp-image-4817\" \/><\/p>\n<p>\u4e09\u89d2\u5f62\u306e\u5f62\u306f\u3069\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3042\u3063\u3066\u3082\u3044\u3044\u3067\u3059\u3002\u3072\u3068\u307e\u305a\u3001\u3053\u306e\u3088\u3046\u306a\u4e09\u89d2\u5f62\u3092\u8003\u3048\u308b\u306e\u3067\u3059\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u516c\u5f0f\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(\\displaystyle\\frac{a}{sinA}=\\displaystyle\\frac{b}{sinB}=\\displaystyle\\frac{c}{sinC}=2R\\)<\/li>\n<\/ul>\n<p>\u3053\u308c\u304c\u6b63\u5f26\u5b9a\u7406\u3067\u3059\u3002<span style=\"color: #0000ff;\">\u89d2\u5ea6\u3068\u8fba\u306e\u9577\u3055\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u307b\u304b\u306e\u8fba\u306e\u9577\u3055\u3084\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/span>sine\uff08\u6b63\u5f26\uff1asin\uff09\u3092\u5229\u7528\u3059\u308b\u516c\u5f0f\u3067\u3042\u308b\u305f\u3081\u6b63\u5f26\u5b9a\u7406\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u30fb\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3059\u308b<\/strong><\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u3067\\(a\\)\u3068\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u6c42\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/reyuf5.jpg\" alt=\"\" width=\"300\" height=\"216\" class=\"aligncenter size-full wp-image-4818\" \/><\/p>\n<p>\u5148\u307b\u3069\u89e3\u8aac\u3057\u305f\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u3001\u8fba\u306e\u9577\u3055\u3092\u51fa\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(\\displaystyle\\frac{3}{sin30\u00b0}=\\displaystyle\\frac{a}{sin45\u00b0}\\)<\/li>\n<\/ul>\n<p>\u3053\u306e\u5f0f\u3092\u89e3\u304d\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{3}{sin30\u00b0}=\\displaystyle\\frac{a}{sin45\u00b0}\\)<\/p>\n<p>\\(3\u00f7\\displaystyle\\frac{1}{2}=a\u00f7\\displaystyle\\frac{1}{\\sqrt{2}}\\)<\/p>\n<p>\\(3\u00d72=a\u00d7\\sqrt{2}\\)<\/p>\n<p>\\(a=\\displaystyle\\frac{6}{\\sqrt{2}}\\)<\/p>\n<p>\\(a=3\\sqrt{2}\\)<\/p>\n<p>\u307e\u305f\u5916\u63a5\u5186\u306e\u534a\u5f84\u306b\u3064\u3044\u3066\u3082\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\\(\\displaystyle\\frac{3}{sin30\u00b0}=2R\\)<\/li>\n<\/ul>\n<p>\u3053\u306e\u5f0f\u3092\u89e3\u304d\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{3}{sin30\u00b0}=2R\\)<\/p>\n<p>\\(3\u00d72=2R\\)<\/p>\n<p>\\(3=R\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u8fba\u306e\u9577\u3055\u3084\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u8a08\u7b97\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001sin\u03b8\u306e\u5024\u304b\u3089\u89d2\u5ea6\u3092\u6c42\u3081\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u4f59\u5f26\u5b9a\u7406\u306b\u3088\u308a\u3001cos\u03b8\u3067\u8fba\u306e\u9577\u3055\u3092\u51fa\u3059<\/h3>\n<p>\u4e00\u65b9\u3067cosine\uff08\u4f59\u5f26\uff1acos\uff09\u3092\u5229\u7528\u3059\u308b\u516c\u5f0f\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u304c\u4f59\u5f26\u5b9a\u7406\u3067\u3059\u3002\u4f59\u5f26\u5b9a\u7406\u3067\u306f\u3001\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u6c42\u3081\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u305d\u306e\u4ee3\u308f\u308a\u3001\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/reyuf6.jpg\" alt=\"\" width=\"242\" height=\"256\" class=\"aligncenter size-full wp-image-4819\" \/><\/p>\n<p>\u3053\u306e\u3068\u304d\u3001\u4ee5\u4e0b\u306e\u516c\u5f0f\u304c\u4f59\u5f26\u5b9a\u7406\u3067\u3059\u3002<\/p>\n<ul>\n<li>\\(a^2=b^2+c^2-2bccosA\\)<\/li>\n<li>\\(b^2=c^2+a^2-2cacosB\\)<\/li>\n<li>\\(c^2=a^2+b^2-2abcosC\\)<\/li>\n<\/ul>\n<p><span style=\"color: #0000ff;\">\u899a\u3048\u65b9\u3068\u3057\u3066\u306f\u3001\u300c2\u8fba\u3068\u305d\u306e\u9593\u306e\u89d2\u3092\u5229\u7528\u3057\u3066\u3001\u89d2\u306e\u5bfe\u8fba\u3092\u8a08\u7b97\u3059\u308b\u300d\u3068\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/span>\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u306b\u300c2\u8fba\u306e\u305d\u306e\u9593\u306e\u89d2\u304c\u7b49\u3057\u3044\u300d\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u5229\u7528\u3057\u3066\u4f59\u5f26\u5b9a\u7406\u3092\u899a\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n<p><strong>\u30fb\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3059\u308b<\/strong><\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u3067\\(a\\)\u306e\u5024\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/reyuf11.jpg\" alt=\"\" width=\"338\" height=\"221\" class=\"aligncenter size-full wp-image-4820\" \/><\/p>\n<p>\\(a^2=b^2+c^2-2bccosA\\)\u3092\u5229\u7528\u3057\u3066\u3001\\(a\\)\u306e\u5024\u3092\u898b\u3064\u3051\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(a^2=3^2+6^2-2\u00d73\u00d76\u00d7cos60\u00b0\\)<\/p>\n<p>\\(a^2=9+36-2\u00d73\u00d76\u00d7\\displaystyle\\frac{1}{2}\\)<\/p>\n<p>\\(a^2=45-18\\)<\/p>\n<p>\\(a^2=27\\)<\/p>\n<p>\\(a=\u00b13\\sqrt{3}\\)<\/p>\n<p>\\(a\\)\u306f\u8fba\u306e\u9577\u3055\u3067\u3042\u308b\u305f\u3081\u3001\\(a&gt;0\\)\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\\(a=3\\sqrt{3}\\)\u304c\u6b63\u89e3\u3067\u3059\u3002<\/p>\n<h3>\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n<p>\u6b63\u5f26\u5b9a\u7406\u3067\u3082\u4f59\u5f26\u5b9a\u7406\u3067\u3082\u3001\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u3092\u4f7f\u3044\u5206\u3051\u308c\u3070\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3067\u306f\u4ee5\u4e0b\u304c\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u4e00\u8fba\u3068\u305d\u306e\u4e21\u7aef\u306e\u89d2\u304c\u7b49\u3057\u3044<\/li>\n<li>\u4e8c\u8fba\u3068\u305d\u306e\u9593\u306e\u89d2\u304c\u7b49\u3057\u3044<\/li>\n<li>\u4e09\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044<\/li>\n<\/ul>\n<p>\u3053\u306e\u5408\u540c\u6761\u4ef6\u3092\u6e80\u305f\u3059\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u4e09\u89d2\u5f62\u306e\u5f62\u304c\u6c7a\u307e\u308a\u307e\u3059\u3002\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306e\u4f7f\u3044\u5206\u3051\u3067\u306f\u3001\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3092\u5229\u7528\u3057\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\u4e00\u3064\u306e\u8fba\u30682\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\uff1a\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528<\/li>\n<li>\u4e8c\u3064\u306e\u8fba\u30681\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\uff1a\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528<\/li>\n<li>\u4e09\u3064\u306e\u8fba\u306e\u9577\u3055\u304c\u308f\u304b\u3063\u3066\u3044\u308b\uff1a\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528<\/li>\n<\/ul>\n<p>\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3068\u304d\u3001\u4e00\u8fba\u3068\u305d\u306e\u4e21\u7aef\u306e\u89d2\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4e21\u7aef\u306e\u89d2\u3067\u306f\u306a\u304f\u3001\u305d\u306e\u4ed6\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308c\u3070\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u5148\u307b\u3069\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u306b\u3064\u3044\u3066\u3001\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\\(a\\)\u306e\u5024\u3092\u8a08\u7b97\u3057\u307e\u3057\u305f\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/reyuf5.jpg\" alt=\"\" width=\"300\" height=\"216\" class=\"aligncenter size-full wp-image-4818\" \/><\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u4e00\u3064\u306e\u8fba\u30682\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308c\u3070\u3044\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u540c\u3058\u3088\u3046\u306b\u4f59\u5f26\u5b9a\u7406\u3067\u3082\u3001\u4e8c\u3064\u306e\u8fba\u30681\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3067\u3042\u308c\u3070\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u4e09\u3064\u306e\u8fba\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u5fc5\u305a\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u89d2\u5ea6\u3092\u3060\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>\u30fb\u4e8c\u3064\u306e\u8fba\u30681\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b<\/strong><\/p>\n<p>\u306a\u304a\u4e8c\u3064\u306e\u8fba\u30681\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3082\u8fba\u306e\u9577\u3055\u3084\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u306b\u3082\u95a2\u308f\u3089\u305a\u3001\u306a\u305c\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u5148\u307b\u3069\u3001\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3057\u305f\u4ee5\u4e0b\u306e\u4e09\u89d2\u5f62\u3067\u8003\u3048\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\/ijhg17.jpg\" alt=\"\" width=\"338\" height=\"221\" class=\"aligncenter size-full wp-image-4822\" \/><\/p>\n<p>\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u3001\u4e00\u3064\u306e\u7b54\u3048\u304c\u51fa\u307e\u3059\u3002\u4e00\u65b9\u3067<span style=\"color: #ff0000;\">\u6b63\u5f26\u5b9a\u7406\u3067\u306f\u3001\u4e8c\u3064\u306e\u7b54\u3048\u306e\u5019\u88dc\u3092\u5f97\u3089\u308c\u307e\u3059\u3002<\/span>\u305d\u306e\u305f\u3081\u3001\u3069\u3061\u3089\u306e\u7b54\u3048\u304c\u6b63\u3057\u3044\u306e\u304b\u78ba\u8a8d\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001\u8a08\u7b97\u30df\u30b9\u304c\u8d77\u3053\u308a\u3084\u3059\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u5148\u307b\u3069\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u305f\u8a08\u7b97\u7d50\u679c\u3088\u308a\u3001\\(a=3\\sqrt{3}\\)\u3067\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u2220B\u306e\u5927\u304d\u3055\u306f\u4f55\u5ea6\u3067\u3057\u3087\u3046\u304b\u3002\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(3^2=6^2+(3\\sqrt{3})^2-2\u00d76\u00d73\\sqrt{3}\u00d7cosB\\)<\/p>\n<p>\\(9=36+27-36\\sqrt{3}cosB\\)<\/p>\n<p>\\(36\\sqrt{3}cosB=54\\)<\/p>\n<p>\\(cosB=\\displaystyle\\frac{54}{36\\sqrt{3}}\\)<\/p>\n<p>\\(cosB=\\displaystyle\\frac{54\u00d7\\sqrt{3}}{36\u00d73}\\)<\/p>\n<p>\\(cosB=\\displaystyle\\frac{\\sqrt{3}}{2}\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(cosB=\\displaystyle\\frac{\\sqrt{3}}{2}\\)\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u6e80\u305f\u3059\u305f\u3081\u306b\u306f\u3001\\(B=30\u00b0\\)\u3067\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002\u3053\u3046\u3057\u3066\u3001\u89d2\u5ea6\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u30fb\u6b63\u5f26\u5b9a\u7406\u3067\u306f\u7b54\u3048\u306e\u5019\u88dc\u304c2\u3064\u51fa\u308b<\/strong><\/p>\n<p>\u4e00\u65b9\u3067\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u3001\u7b54\u3048\u306e\u5019\u88dc\u304c2\u3064\u51fa\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u6b63\u5f26\u5b9a\u7406\u3067\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(\\displaystyle\\frac{3}{sinB}=\\displaystyle\\frac{3\\sqrt{3}}{sin60\u00b0}\\)<\/p>\n<p>\\(\\displaystyle\\frac{3}{sinB}=3\\sqrt{3}\u00f7sin60\u00b0\\)<\/p>\n<p>\\(\\displaystyle\\frac{3}{sinB}=3\\sqrt{3}\u00f7\\displaystyle\\frac{\\sqrt{3}}{2}\\)<\/p>\n<p>\\(\\displaystyle\\frac{3}{sinB}=3\\sqrt{3}\u00d7\\displaystyle\\frac{2}{\\sqrt{3}}\\)<\/p>\n<p>\\(\\displaystyle\\frac{3}{sinB}=6\\)<\/p>\n<p>\\(sinB=\\displaystyle\\frac{1}{2}\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(sinB=\\displaystyle\\frac{1}{2}\\)\u3068\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\\(sinB=\\displaystyle\\frac{1}{2}\\)\u3092\u6e80\u305f\u3059\u89d2\u5ea6\u3068\u3057\u3066\u306f30\u00b0\u3068150\u00b0\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u30682\u3064\u306e\u89d2\u5ea6\u304c\u51fa\u3066\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u4e00\u3064\u306e\u89d2\u5ea6\u306f60\u00b0\u3068\u6c7a\u307e\u3063\u3066\u3044\u307e\u3059\u3002\u3082\u3057\u2220B\u304c150\u00b0\u306e\u5834\u5408\u30012\u3064\u306e\u89d2\u5ea6\u3092\u8db3\u3059\u3068210\u00b0\u306b\u306a\u308a\u307e\u3059\u3002\u4e09\u89d2\u5f62\u306e\u5185\u95a3\u306e\u548c\u306f\u5fc5\u305a180\u00b0\u306b\u306a\u308b\u305f\u3081\u3001\u2220B\u304c150\u00b0\u306b\u306a\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u2220B\u306f30\u00b0\u3067\u3042\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u6b63\u5f26\u5b9a\u7406\u3067\u3042\u3063\u3066\u3082\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u7b54\u3048\u306e\u5019\u88dc\u304c2\u3064\u51fa\u3066\u304f\u308b\u305f\u3081\u3001\u4e8c\u8fba\u30681\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u6b63\u5f26\u5b9a\u7406\u3067\u306f\u306a\u304f\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u8fba\u306e\u9577\u3055\u3068\u89d2\u306e\u5927\u5c0f\u95a2\u4fc2<\/h2>\n<p>\u3053\u3053\u307e\u3067\u306e\u5185\u5bb9\u3092\u7406\u89e3\u3057\u305f\u5f8c\u3001\u4e09\u89d2\u5f62\u306e\u89d2\u5ea6\u306e\u5927\u304d\u3055\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u611f\u899a\u7684\u306b\u308f\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u4e09\u89d2\u5f62\u3067\u89d2\u5ea6\u304c\u5927\u304d\u3044\u5834\u5408\u3001\u305d\u306e\u5bfe\u8fba\u306f\u9577\u304f\u306a\u308a\u307e\u3059\u3002\u4e00\u65b9\u3067\u89d2\u5ea6\u304c\u5c0f\u3055\u3044\u5834\u5408\u3001\u5bfe\u8fba\u306e\u9577\u3055\u306f\u77ed\u3044\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/reyuf14.jpg\" alt=\"\" width=\"600\" height=\"129\" class=\"aligncenter size-full wp-image-4823\" \/><\/p>\n<p>\u3053\u306e\u6027\u8cea\u3092\u5229\u7528\u3057\u3066\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001\u25b3ABC\u3067\\(\\displaystyle\\frac{\\sqrt{3}}{sinA}\\)\\(=\\displaystyle\\frac{\\sqrt{7}}{sinB}\\)\\(=\\displaystyle\\frac{1}{sinC}\\)\u304c\u6210\u308a\u7acb\u3064\u3068\u304d\u3001\u6700\u3082\u5927\u304d\u3044\u89d2\u5ea6\u306f\u4f55\u5ea6\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u6b63\u5f26\u5b9a\u7406\u3088\u308a\u3001\\(a:b:c\\)\\(=sinA:sinB:sinc\\)\\(=\\sqrt{3}:\\sqrt{7}:1\\)\u306b\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(\\displaystyle\\frac{a}{\\sqrt{3}}\\)\\(=\\displaystyle\\frac{b}{\\sqrt{7}}\\)\\(=\\displaystyle\\frac{c}{1}=k(k&gt;0)\\)<\/li>\n<\/ul>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\\(a=\\sqrt{3}k\\)\u3001\\(b=\\sqrt{7}k\\)\u3001\\(c=k\\)\u3068\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u6700\u3082\u5927\u304d\u3044\u89d2\u5ea6\u3067\u306f\u3001\u305d\u306e\u5bfe\u8fba\u306e\u9577\u3055\u304c\u6700\u3082\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u8fba\u306e\u9577\u3055\u3092\u6bd4\u3079\u308b\u3068\u3001\\(b\\)\u306e\u9577\u3055\u304c\u6700\u3082\u5927\u304d\u3044\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u6700\u3082\u5927\u304d\u3044\u89d2\u5ea6\u306f\u2220B\u3067\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u89d2\u5ea6\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(b^2=c^2+a^2-2cacosB\\)<\/p>\n<p>\u4ee3\u5165\u3059\u308b\u3068<\/p>\n<p>\\((\\sqrt{7}k)^2=(\\sqrt{3}k)^2+k^2-2\u00d7\\sqrt{3}k\u00d7k\u00d7cosB\\)<\/p>\n<p>\\(7k^2=3k^2+k^2-2\\sqrt{3}k^2cosB\\)<\/p>\n<p>\\(2\\sqrt{3}k^2cosB=-3k^2\\)<\/p>\n<p>\\(2\\sqrt{3}cosB=-3\\)<\/p>\n<p>\\(cosB=-\\displaystyle\\frac{3}{2\\sqrt{3}}\\)<\/p>\n<p>\\(cosB=-\\displaystyle\\frac{\\sqrt{3}}{2}\\)<\/p>\n<p>\\(cosB=-\\displaystyle\\frac{\\sqrt{3}}{2}\\)\u3068\u306a\u308b\u306e\u306f\u3001\u2220B\u304c150\u00b0\u306e\u3068\u304d\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u6700\u5927\u306e\u89d2\u5ea6\u306f150\u00b0\u3067\u3042\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h2>\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306e\u516c\u5f0f\u3092\u899a\u3048\u308b<\/h2>\n<p>\u91cd\u8981\u306a\u516c\u5f0f\u304c\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u3067\u3059\u3002\u516c\u5f0f\u3092\u899a\u3048\u308b\u5fc5\u8981\u306f\u3042\u308b\u3082\u306e\u306e\u3001\u516c\u5f0f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u4e09\u89d2\u5f62\u306e\u8fba\u3084\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u8fba\u3084\u89d2\u5ea6\u3092\u8a08\u7b97\u3067\u304d\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u3001\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306f\u4f3c\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3001\u5229\u7528\u3059\u308b\u5834\u9762\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u4e00\u8fba\u306e\u9577\u3055\u30682\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u6b63\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u51fa\u3057\u305f\u3044\u3068\u304d\u306b\u3064\u3044\u3066\u3082\u6b63\u5f26\u5b9a\u7406\u304c\u6709\u52b9\u3067\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3067\u4e8c\u8fba\u306e\u9577\u3055\u30681\u3064\u306e\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002\u4e09\u8fba\u306e\u9577\u3055\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u3068\u304d\u3082\u4f59\u5f26\u5b9a\u7406\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>sin\u03b8\u3068cos\u03b8\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u3069\u306e\u3088\u3046\u306b\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u306e\u5927\u304d\u3055\u3092\u8a08\u7b97\u3059\u308c\u3070\u3044\u3044\u306e\u304b\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e09\u89d2\u6bd4\u3067\u5229\u7528\u3055\u308c\u308b\u516c\u5f0f\u3068\u3057\u3066\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u304c\u3042\u308a\u307e\u3059\u3002\u4e09\u89d2\u6bd4\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u8fba\u306e\u9577\u3055\uff08\u307e\u305f\u306f\u4e09\u89d2\u6bd4\u306e\u5024\uff09\u3092\u6c42\u3081\u3089\u308c\u308b\u516c\u5f0f\u304c\u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u3067\u3059\u3002 \u6b63\u5f26\u5b9a\u7406\u3068\u4f59\u5f26\u5b9a\u7406\u306f\u300c\u308f\u304b\u3089\u306a\u3044\u8fba\u306e\u9577\u3055\u3084\u89d2\u5ea6\u3092\u8a08\u7b97\u3067\u304d\u308b\u300d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4827,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":{"0":"post-4815","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\/4815","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=4815"}],"version-history":[{"count":3,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4815\/revisions"}],"predecessor-version":[{"id":7944,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4815\/revisions\/7944"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media\/4827"}],"wp:attachment":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media?parent=4815"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/categories?post=4815"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/tags?post=4815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}