{"id":6693,"date":"2022-05-29T13:25:14","date_gmt":"2022-05-29T04:25:14","guid":{"rendered":"https:\/\/hatsudy.com\/jp\/?p=6693"},"modified":"2022-06-01T09:43:29","modified_gmt":"2022-06-01T00:43:29","slug":"quadrilateral-theorem","status":"publish","type":"post","link":"https:\/\/hatsudy.com\/jp\/quadrilateral-theorem.html","title":{"rendered":"\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306e\u5b9a\u7406\uff1a\u89d2\u5ea6\u306e\u8a08\u7b97\u3084\u8a3c\u660e\u3001\u30c8\u30ec\u30df\u30fc\u306e\u6cd5\u5247"},"content":{"rendered":"\n<p>\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306b\u7279\u6709\u306e\u5b9a\u7406\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u6700\u3082\u6709\u540d\u306a\u306e\u306f\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3067\u3042\u308a\u3001\u591a\u304f\u306e\u4eba\u304c\u65e2\u306b\u7406\u89e3\u3057\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u56db\u89d2\u5f62\u3067\u306f\u5bfe\u89d2\u3092\u8db3\u3059\u3053\u3068\u3067180\u00b0\u306b\u306a\u308b\u3053\u3068\u3082\u6709\u540d\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e\u6027\u8cea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u89d2\u5ea6\u306e\u8a08\u7b97\u3092\u3057\u305f\u308a\u3001\u8a3c\u660e\u554f\u984c\u3092\u89e3\u3044\u305f\u308a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u8907\u96d1\u306a\u56f3\u5f62\u306b\u3064\u3044\u3066\u3001\u89d2\u5ea6\u306e\u8a08\u7b97\u3092\u3059\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3067\u306f\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3082\u5b58\u5728\u3057\u307e\u3059\u3002\u6709\u540d\u306a\u5b9a\u7406\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u307b\u304b\u306e\u5b9a\u7406\u306b\u6bd4\u3079\u308b\u3068\u91cd\u8981\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u4f59\u529b\u304c\u3042\u308c\u3070\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3082\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u5b9a\u7406\u3092\u899a\u3048\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u5b9a\u7406\u3092\u5229\u7528\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u554f\u984c\u3092\u89e3\u304f\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u305d\u3053\u3067\u3001\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306b\u3069\u306e\u3088\u3046\u306a\u6027\u8cea\u304c\u3042\u308b\u306e\u304b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>\u5fc5\u305a\u899a\u3048\u308b\u3079\u304d\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306e\u5b9a\u7406<\/h2>\n<p>\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3067\u5fc5\u305a\u899a\u3048\u308b\u3079\u304d\u5b9a\u7406\u304c\u3042\u308a\u307e\u3059\u3002\u5b9a\u7406\u3092\u899a\u3048\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u554f\u984c\u3092\u89e3\u304f\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u9ad8\u6821\u6570\u5b66\u3067\u306f\u4ee5\u4e0b\u306e\u5b9a\u7406\u3092\u5fc5\u305a\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\u5186\u5468\u89d2\u306e\u5b9a\u7406<\/li>\n<li>\u5bfe\u89d2\u306e\u548c\u306f180\u00b0\u306b\u306a\u308b<\/li>\n<\/ul>\n<p>\u305d\u308c\u305e\u308c\u306e\u5185\u5bb9\u3092\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u5186\u5468\u89d2\u306e\u5b9a\u7406\u306f\u6700\u3082\u6709\u540d<\/h3>\n<p>\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3067\u306f\u3001\u6700\u3082\u5358\u7d14\u306a\u5b9a\u7406\u306e\u4e00\u3064\u304c\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3067\u3059\u3002\u4e09\u89d2\u5f62\u3092\u5229\u7528\u3059\u308b\u5b9a\u7406\u3067\u306f\u3042\u308b\u3082\u306e\u306e\u3001\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3067\u306f\u307b\u3068\u3093\u3069\u306e\u30b1\u30fc\u30b9\u3067\u56db\u89d2\u5f62\u3092\u542b\u3080\u554f\u984c\u304c\u51fa\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3068\u56db\u89d2\u5f62\u306e\u95a2\u4fc2\u304c\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u3079\u3066\u306e\u5186\u5468\u89d2\\(a\\)\u306f\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3319\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/05\/erht13-1.jpg\" alt=\"\" width=\"268\" height=\"297\" \/><\/p>\n<p>\u307e\u305f\u5186\u5468\u89d2\u3068\u4e2d\u5fc3\u89d2\u3092\u6bd4\u3079\u308b\u3068\u304d\u3001\u5186\u5468\u89d2\u306e2\u500d\u304c\u4e2d\u5fc3\u89d2\u306e\u5927\u304d\u3055\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3316\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/05\/erht12.jpg\" alt=\"\" width=\"267\" height=\"294\" \/><\/p>\n<p>\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3068\u3044\u3046\u306e\u306f\u3001\u300c\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306b\u95a2\u3059\u308b\u305d\u306e\u4ed6\u306e\u5b9a\u7406\u300d\u306e\u57fa\u790e\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3092\u5229\u7528\u3059\u308c\u3070\u3001\u305d\u306e\u4ed6\u306e\u5b9a\u7406\u3092\u8a3c\u660e\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<h3>\u5bfe\u89d2\u306e\u548c\u306f180\u00b0\u306b\u306a\u308b<\/h3>\n<p>\u6b21\u306b\u7406\u89e3\u3059\u308b\u3079\u304d\u5185\u5bb9\u3068\u3057\u3066\u3001\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3067\u306f\u5bfe\u89d2\u306e\u548c\u304c\u5fc5\u305a180\u00b0\u306b\u306a\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u56db\u89d2\u5f62ABCD\u306b\u3064\u3044\u3066\u3001\u2220A\u3068\u2220C\u3092\u8db3\u3059\u3068180\u00b0\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u2220A\u306f\u5bfe\u89d2\u306e\u5916\u89d2\u3068\u7b49\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw6.jpg\" alt=\"\" width=\"310\" height=\"265\" class=\"aligncenter size-full wp-image-6694\" \/><\/p>\n<p>\u3053\u306e\u5b9a\u7406\u306e\u8a3c\u660e\u306f\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u53ef\u80fd\u3067\u3059\u3002\u5186\u306e\u4e2d\u5fc3\u3092O\u3068\u3059\u308b\u3068\u3001\u2220A\u306e2\u500d\u3068\u2220C\u30922\u500d\u3059\u308b\u3053\u3068\u3067360\u00b0\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw7.jpg\" alt=\"\" width=\"310\" height=\"264\" class=\"aligncenter size-full wp-image-6695\" \/><\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7406\u3092\u8a3c\u660e\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(2\u00d7\u2220A+2\u00d7\u2220C=360\u00b0\\)<\/p>\n<p>\\(\u2220A+\u2220C=180\u00b0\\)<\/p>\n<p>\\(\u2220A=180\u00b0-\u2220C\\)<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u5186\u306b\u5185\u63a5\u3057\u3066\u3044\u308b\u4ee5\u4e0b\u306e\u56db\u89d2\u5f62\u306b\u3064\u3044\u3066\u3001\u2220C\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\/05\/jdhw9.jpg\" alt=\"\" width=\"397\" height=\"348\" class=\"aligncenter size-full wp-image-6705\" \/><\/p>\n<p><span style=\"color: #0000ff;\">\u56f3\u5f62\u306e\u554f\u984c\u3092\u89e3\u304f\u3068\u304d\u3001\u308f\u304b\u308b\u89d2\u5ea6\u3092\u30e9\u30f3\u30c0\u30e0\u306b\u57cb\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/span>\u4eca\u56de\u306e\u554f\u984c\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u89d2\u5ea6\u3092\u8a18\u3059\u3068\u3044\u3044\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw10.jpg\" alt=\"\" width=\"431\" height=\"352\" class=\"aligncenter size-full wp-image-6706\" \/><\/p>\n<p>\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3067\u306f\u3001\u5bfe\u89d2\u306e\u5916\u89d2\u304c\u7b49\u3057\u3044\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4e0a\u56f3\u306e\u3088\u3046\u306b\u2220C\u3092\u8a18\u5165\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u4e09\u89d2\u5f62\u30672\u3064\u306e\u89d2\u5ea6\u3092\u8db3\u3059\u3068\u3001\u6b8b\u308a\u306e\u89d2\u306e\u5916\u89d2\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u2220B\uff08\u2220ABC\uff09\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(\u2220B=30\u00b0+\u2220C\\)<\/p>\n<p>\u307e\u305f\u4e09\u89d2\u5f62\u306e\u89d2\u5ea6\u306e\u5408\u8a08\u306f180\u00b0\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u8a08\u7b97\u306b\u3088\u3063\u3066\u2220C\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(25+\u2220B+\u2220C=180\\)<\/p>\n<p>\\(25+30+\u2220C+\u2220C=180\\)<\/p>\n<p>\\(2\u2220C=125\\)<\/p>\n<p>\\(\u2220C=62.5\\)<\/p>\n<h2>\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3082\u5b58\u5728\u3059\u308b<\/h2>\n<p>\u5148\u307b\u3069\u306e\u5b9a\u7406\u306b\u6bd4\u3079\u3066\u91cd\u8981\u5ea6\u306f\u52a3\u308b\u3082\u306e\u306e\u3001\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3082\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3067\u5229\u7528\u3067\u304d\u308b\u5b9a\u7406\u3067\u3059\u3002\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3092\u5229\u7528\u3067\u304d\u308b\u5834\u9762\u304c\u3042\u308b\u5834\u5408\u3001\u8a08\u7b97\u6642\u9593\u3092\u5927\u5e45\u306b\u77ed\u7e2e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5bfe\u8fba\u306e\u7a4d\uff0b\u5bfe\u8fba\u306e\u7a4d\uff1d\u5bfe\u89d2\u7dda\u306e\u7a4d<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/fje7.jpg\" alt=\"\" width=\"446\" height=\"297\" class=\"aligncenter size-full wp-image-6789\" \/><\/p>\n<p>\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3092\u5229\u7528\u3067\u304d\u308b\u5834\u5408\u3001\u7a4d\u6975\u7684\u306b\u6d3b\u7528\u3057\u307e\u3057\u3087\u3046\u3002<span style=\"color: #0000ff;\">\u56f3\u5f62\u304c\u5186\u306b\u5185\u63a5\u3057\u3066\u304a\u308a\u3001\u5bfe\u89d2\u7dda\u3092\u5f15\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3042\u308c\u3070\u3001\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u306e\u5229\u7528\u3092\u691c\u8a0e\u3059\u308b\u306e\u3067\u3059\u3002<\/span>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u554f\u984c\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\u4e00\u8fba\u306e\u9577\u3055\u304c1\u3067\u3042\u308b\u6b63\u4e94\u89d2\u5f62\u306b\u3064\u3044\u3066\u3001\u5bfe\u89d2\u7dda\u306e\u9577\u3055\u3092\u6c42\u3081\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw12.jpg\" alt=\"\" width=\"241\" height=\"241\" class=\"aligncenter size-full wp-image-6713\" srcset=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw12.jpg 241w, https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw12-150x150.jpg 150w\" sizes=\"auto, (max-width: 241px) 100vw, 241px\" \/><\/p>\n<p>\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3092\u5229\u7528\u3057\u306a\u3044\u5834\u5408\u3001\u76f8\u4f3c\u56f3\u5f62\u3092\u7528\u3044\u3066\u554f\u984c\u3092\u89e3\u304d\u307e\u3059\u3002\u4e00\u65b9\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3092\u60f3\u5b9a\u3059\u308c\u3070\u3001\u30c8\u30ec\u30df\u30fc\u306e\u6cd5\u5247\u306b\u3088\u3063\u3066\u3059\u3050\u306b\u7b54\u3048\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw13.jpg\" alt=\"\" width=\"245\" height=\"253\" class=\"aligncenter size-full wp-image-6714\" \/><\/p>\n<p>\u5bfe\u89d2\u7dda\u306e\u9577\u3055\u3092\\(x\\)\u3068\u3059\u308b\u3068\u3001\u30c8\u30ec\u30df\u30fc\u306e\u6cd5\u5247\u3092\u5229\u7528\u3057\u3066\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(1+x=x^2\\)<\/p>\n<p>\\(x^2-x-1=0\\)<\/p>\n<p>\\(x=\\displaystyle\\frac{1\u00b1\\sqrt{5}}{2}\\)<\/p>\n<p>\\(x&gt;0\\)\u306a\u306e\u3067\u3001\\(x=\\displaystyle\\frac{1+\\sqrt{5}}{2}\\)\u3068\u7b54\u3048\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u306a\u305c\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u304c\u6210\u308a\u7acb\u3064\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u8a3c\u660e\u65b9\u6cd5\u306f\u8907\u6570\u3042\u308a\u3001\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u65b9\u6cd5\u306f\u4f59\u5f26\u5b9a\u7406\u3092\u7528\u3044\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<p>AB\u3001BC\u3001CD\u3001DA\u3092\u305d\u308c\u305e\u308c\\(a\\)\u3001\\(b\\)\u3001\\(c\\)\u3001\\(d\\)\u3068\u3057\u307e\u3059\u3002\u307e\u305fAC\u3092\\(e\\)\u3001BD\u3092\\(f\\)\u3068\u3057\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u3001\u30c8\u30ec\u30df\u30fc\u306e\u6cd5\u5247\u304c\u6210\u308a\u7acb\u3064\u3053\u3068\u3092\u8a3c\u660e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jdhw15.jpg\" alt=\"\" width=\"292\" height=\"254\" class=\"aligncenter size-full wp-image-6716\" \/><\/p>\n<p>\u25b3ABC\u306b\u3064\u3044\u3066\u3001\u4f59\u5f26\u5b9a\u7406\u3088\u308a\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(cosB=\\displaystyle\\frac{a^2+b^2-e^2}{2ab}\\)<\/p>\n<p>\u307e\u305f\u25b3ADC\u306b\u3064\u3044\u3066\u3001\u4f59\u5f26\u5b9a\u7406\u3088\u308a\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(cosD=\\displaystyle\\frac{c^2+d^2-e^2}{2cd}\\)<\/p>\n<p>\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306e\u5834\u5408\u3001\u5bfe\u89d2\u3092\u8db3\u3059\u3068180\u00b0\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\\(\u2220D=180\u00b0-\u2220B\\)\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(cosD=\\displaystyle\\frac{c^2+d^2-e^2}{2cd}\\)<\/p>\n<p>\\(cos(180\u00b0-\u2220B)=\\displaystyle\\frac{c^2+d^2-e^2}{2cd}\\)<\/p>\n<p>\\(cosB=-\\displaystyle\\frac{c^2+d^2-e^2}{2cd}\\)<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308c\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{a^2+b^2-e^2}{2ab}=-\\displaystyle\\frac{c^2+d^2-e^2}{2cd}\\)<\/p>\n<p>\u3053\u306e\u7b49\u5f0f\u306b\u3064\u3044\u3066\u3001\\(e\\)\u306b\u3064\u3044\u3066\u89e3\u304f\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(e^2=\\displaystyle\\frac{(ac+bd)(ad+bc)}{ab+cd}\\)<\/p>\n<p>\u540c\u69d8\u306e\u65b9\u6cd5\u306b\u3088\u3063\u3066\u3001\u25b3ABD\u3068\u25b3ADC\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\\(f\\)\u306b\u3064\u3044\u3066\u89e3\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(f^2=\\displaystyle\\frac{(ac+bd)(ab+cd)}{ad+bc}\\)<\/p>\n<p>\u305d\u3053\u3067\u3001\\(e^2\u00d7f^2\\)\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(e^2\u00d7f^2\\)<\/p>\n<p>\\(=\\displaystyle\\frac{(ac+bd)(ad+bc)}{ab+cd}\u00d7\\displaystyle\\frac{(ac+bd)(ab+cd)}{ad+bc}\\)<\/p>\n<p>\\(=(ac+bd)^2\\)<\/p>\n<p>\u305d\u3053\u3067\u3001\u5e73\u65b9\u6839\u3092\u5229\u7528\u3057\u3066\u4e8c\u4e57\u3092\u53d6\u308a\u53bb\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(ef=ac+bd\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\u30c8\u30ec\u30df\u30fc\u306e\u6cd5\u5247\u3092\u8a3c\u660e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u4f59\u5f26\u5b9a\u7406\u3092\u7528\u3044\u308b\u8a3c\u660e\u65b9\u6cd5\u3067\u3042\u3063\u3066\u3082\u591a\u5c11\u8907\u96d1\u3067\u3059\u3002\u305f\u3060\u3044\u305a\u308c\u306b\u3057\u3066\u3082\u3001\u3053\u306e\u65b9\u6cd5\u306b\u3088\u3063\u3066\u30c8\u30ec\u30df\u30fc\u306e\u6cd5\u5247\u3092\u8a3c\u660e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306e\u5b9a\u7406\u3092\u899a\u3048\u308b<\/h2>\n<p>\u56db\u89d2\u5f62\u306e\u4e2d\u3067\u3082\u3001\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306b\u7279\u6709\u306e\u5b9a\u7406\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u3092\u767a\u898b\u3057\u305f\u3089\u3001\u3053\u3053\u307e\u3067\u89e3\u8aac\u3057\u305f\u5b9a\u7406\u3092\u5229\u7528\u3067\u304d\u306a\u3044\u304b\u3092\u8003\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u89d2\u5ea6\u3092\u898b\u3064\u3051\u308b\u3068\u304d\u3001\u591a\u304f\u306e\u30b1\u30fc\u30b9\u3067\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3092\u5229\u7528\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u5bfe\u89d2\u306e\u548c\u304c180\u00b0\u306b\u306a\u308b\u6027\u8cea\u3092\u5229\u7528\u3057\u3066\u89d2\u5ea6\u3092\u8a08\u7b97\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u3053\u3068\u3082\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u306b\u52a0\u3048\u3066\u3001\u91cd\u8981\u5ea6\u306f\u843d\u3061\u308b\u3082\u306e\u306e\u30c8\u30ec\u30df\u30fc\u306e\u5b9a\u7406\u3082\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306b\u3064\u3044\u3066\u3001\u5bfe\u89d2\u7dda\u3092\u5f15\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u5834\u5408\u3001\u30c8\u30ec\u30df\u30fc\u306e\u6cd5\u5247\u3092\u5229\u7528\u3067\u304d\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u8fba\u306e\u9577\u3055\u306e\u8a08\u7b97\u304c\u697d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u305c\u3053\u308c\u3089\u306e\u5b9a\u7406\u304c\u6210\u308a\u7acb\u3064\u306e\u304b\u306b\u3064\u3044\u3066\u3001\u8a3c\u660e\u3092\u542b\u3081\u3066\u89e3\u8aac\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u304c\u63d0\u793a\u3055\u308c\u305f\u5834\u5408\u3001\u3053\u3053\u307e\u3067\u89e3\u8aac\u3057\u305f\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u56f3\u5f62\u554f\u984c\u3092\u89e3\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306b\u7279\u6709\u306e\u5b9a\u7406\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u6700\u3082\u6709\u540d\u306a\u306e\u306f\u5186\u5468\u89d2\u306e\u5b9a\u7406\u3067\u3042\u308a\u3001\u591a\u304f\u306e\u4eba\u304c\u65e2\u306b\u7406\u89e3\u3057\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u56db\u89d2\u5f62\u3067\u306f\u5bfe\u89d2\u3092\u8db3\u3059\u3053\u3068\u3067180\u00b0\u306b\u306a\u308b\u3053\u3068\u3082\u6709\u540d\u3067\u3059\u3002 \u3053\u308c\u3089\u306e\u6027\u8cea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u89d2\u5ea6\u306e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6724,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":{"0":"post-6693","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\/6693","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=6693"}],"version-history":[{"count":11,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/6693\/revisions"}],"predecessor-version":[{"id":6833,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/6693\/revisions\/6833"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media\/6724"}],"wp:attachment":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media?parent=6693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/categories?post=6693"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/tags?post=6693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}