{"id":6564,"date":"2022-05-26T15:58:55","date_gmt":"2022-05-26T06:58:55","guid":{"rendered":"https:\/\/hatsudy.com\/jp\/?p=6564"},"modified":"2022-05-30T14:59:22","modified_gmt":"2022-05-30T05:59:22","slug":"triangle-theorems","status":"publish","type":"post","link":"https:\/\/hatsudy.com\/jp\/triangle-theorems.html","title":{"rendered":"\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\uff1a\u5916\u5fc3\u3001\u5782\u5fc3\u3001\u5185\u5fc3\u3001\u91cd\u5fc3\u3001\u4e2d\u7dda\u5b9a\u7406\u306e\u6027\u8cea"},"content":{"rendered":"<p><span><\/span><\/p>\n<p>\u9ad8\u6821\u6570\u5b66\u3067\u5b66\u3076\u5185\u5bb9\u306e\u4e00\u3064\u306b\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u304c\u3042\u308a\u307e\u3059\u3002\u4e09\u89d2\u5f62\u306b\u306f\u5fc5\u305a\u5916\u63a5\u5186\u3084\u5185\u63a5\u5186\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u4e09\u89d2\u5f62\u306b\u306f\u5782\u5fc3\u3084\u91cd\u5fc3\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6027\u8cea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u8fba\u306e\u9577\u3055\u3092\u8a08\u7b97\u3057\u305f\u308a\u3001\u8a3c\u660e\u554f\u984c\u3092\u89e3\u3044\u305f\u308a\u3059\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u305f\u3060\u3001\u305d\u308c\u305e\u308c\u306e\u5b9a\u7406\u306f\u72ec\u7acb\u3057\u3066\u3044\u307e\u3059\u3002\u4e09\u89d2\u5f62\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306f\u5171\u901a\u3057\u3066\u3044\u308b\u3082\u306e\u306e\u3001\u3059\u3079\u3066\u306e\u5b9a\u7406\u306e\u5185\u5bb9\u3092\u899a\u3048\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u3092\u899a\u3048\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u554f\u984c\u3092\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u554f\u984c\u3067\u306f\u3001\u8907\u5408\u554f\u984c\u304c\u3072\u3093\u3071\u3093\u306b\u51fa\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u8907\u6570\u306e\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u554f\u984c\u3092\u89e3\u304b\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u306b\u306f\u3069\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u4e09\u89d2\u5f62\u304c\u3082\u3064\u5b9a\u7406\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>\u4e09\u89d2\u5f62\u304c\u3082\u30645\u3064\u306e\u5b9a\u7406<\/h2>\n<p>\u3059\u3079\u3066\u306e\u4e09\u89d2\u5f62\u306b\u5171\u901a\u3059\u308b\u5b9a\u7406\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u6700\u3082\u91cd\u8981\u306a\u56f3\u5f62\u306e\u4e00\u3064\u304c\u4e09\u89d2\u5f62\u3067\u3042\u308a\u3001\u6570\u5b66\u306e\u554f\u984c\u3067\u306f\u4e09\u89d2\u5f62\u304c\u3072\u3093\u3071\u3093\u306b\u51fa\u3055\u308c\u307e\u3059\u3002\u307e\u305f\u524d\u8ff0\u306e\u901a\u308a\u3001\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u3092\u899a\u3048\u3066\u3044\u306a\u3044\u3068\u554f\u984c\u3092\u89e3\u3051\u306a\u3044\u3053\u3068\u306f\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u306b\u306f\u4e3b\u306b\u4ee5\u4e0b\u306e5\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u4e09\u89d2\u5f62\u306e\u5916\u5fc3\u306e\u5b9a\u7406<\/li>\n<li>\u4e09\u89d2\u5f62\u306e\u5782\u5fc3\u306e\u5b9a\u7406<\/li>\n<li>\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u306e\u5b9a\u7406<\/li>\n<li>\u4e09\u89d2\u5f62\u306e\u91cd\u5fc3\u306e\u5b9a\u7406<\/li>\n<li>\u4e2d\u7dda\u5b9a\u7406<\/li>\n<\/ul>\n<p>\u305d\u3053\u3067\u3001\u3053\u308c\u3089\u306e\u5b9a\u7406\u306e\u5185\u5bb9\u3092\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u4e09\u89d2\u5f62\u306e\u5916\u5fc3\u306e\u5b9a\u7406\uff1a\u4e09\u89d2\u5f62\u306e\u5916\u63a5\u5186<\/h3>\n<p>\u3059\u3079\u3066\u306e\u4e09\u89d2\u5f62\u306b\u306f\u5916\u63a5\u5186\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u4e09\u89d2\u5f62\u306e\u5916\u306b\u63a5\u3059\u308b\u5186\u3092\u5fc5\u305a\u63cf\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/kejf1.jpg\" alt=\"\" width=\"340\" height=\"276\" class=\"aligncenter size-full wp-image-6612\" \/><\/p>\n<p>\u305d\u3053\u3067\u3001\u305d\u308c\u305e\u308c\u306e\u8fba\u306b\u3064\u3044\u3066\u3001\u5782\u76f4\u4e8c\u7b49\u5206\u7dda\u3092\u5f15\u304d\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u5782\u76f4\u4e8c\u7b49\u5206\u7dda\u306f\u5fc5\u305a\u4e00\u70b9\u3067\u4ea4\u308f\u308a\u307e\u3059\u3002\u3088\u308a\u8a73\u3057\u304f\u3044\u3046\u3068\u3001<span style=\"color: #0000ff;\">\u5782\u76f4\u4e8c\u7b49\u5206\u7dda\u306f\u5916\u63a5\u5186\u306e\u4e2d\u5fc3O\u3067\u4ea4\u308f\u308a\u307e\u3059\u3002<\/span><\/p>\n<p>\u307e\u305f\u70b9O\u306f\u5916\u63a5\u5186\u306e\u4e2d\u5fc3\u3067\u3042\u308b\u305f\u3081\u3001OA=OB=OC\u3067\u3059\u3002\u307e\u305f\u4e09\u89d2\u5f62\u306b\u3068\u3063\u3066\u3001\u70b9O\u3092<span style=\"color: #ff0000;\">\u5916\u5fc3<\/span>\u3068\u3044\u3044\u307e\u3059\u3002\u5916\u63a5\u5186\u3092\u57fa\u6e96\u306b\u3059\u308b\u3068\u3001\u70b9O\u306f\u5186\u306e\u4e2d\u5fc3\u3067\u3059\u3002\u4e00\u65b9\u3001\u4e09\u89d2\u5f62\u3092\u57fa\u6e96\u306b\u3059\u308b\u3068\u70b9O\u306f\u5916\u5fc3\u3068\u3044\u3046\u540d\u524d\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/kejf2.jpg\" alt=\"\" width=\"305\" height=\"266\" class=\"aligncenter size-full wp-image-6613\" \/><\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u4e09\u89d2\u5f62\u306e\u5916\u5fc3\u3092\u5229\u7528\u3057\u3066\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u56f3\u3067\u25b3ABC\u306e\u5916\u5fc3\u3092O\u3068\u3059\u308b\u3068\u304d\u3001\\(\u2220a\\)\u3068\\(\u2220b\\)\u306e\u5927\u304d\u3055\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\/05\/kejf3.jpg\" alt=\"\" width=\"304\" height=\"269\" class=\"aligncenter size-full wp-image-6614\" \/><\/p>\n<p><span style=\"color: #0000ff;\">\u5916\u5fc3O\u3068\u3044\u3046\u306e\u306f\u3001\u5916\u63a5\u5186\u306e\u4e2d\u5fc3\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/span>\u305d\u306e\u305f\u3081OA=OB=OC\u3067\u3042\u308a\u30013\u3064\u306e\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/kejf4.jpg\" alt=\"\" width=\"304\" height=\"268\" class=\"aligncenter size-full wp-image-6615\" \/><\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(\u2220a=30\u00b0\\)\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u307e\u305f\u4e09\u89d2\u5f62\u306e\u5185\u89d2\u306e\u548c\u306f180\u00b0\u306a\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(180=60+40+2b\\)<\/p>\n<p>\\(2b=80\\)<\/p>\n<p>\\(b=40\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(\u2220b=40\u00b0\\)\u3068\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<h3>\u4e09\u89d2\u5f62\u306e\u5782\u5fc3\u306e\u5b9a\u7406\uff1a\u9802\u70b9\u304b\u3089\u5782\u76f4\u306b\u7dda\u3092\u304a\u308d\u3059<\/h3>\n<p>\u5148\u307b\u3069\u3001\u8fba\u306e\u5782\u76f4\u4e8c\u7b49\u5206\u7dda\u3092\u5229\u7528\u3057\u307e\u3057\u305f\u3002\u6b21\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u9802\u70b9\u304b\u3089\u8fba\u306b\u5bfe\u3057\u3066\u5782\u76f4\u306b\u306a\u308b\u3088\u3046\u306b\u7dda\u3092\u5f15\u304d\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/kejf7.jpg\" alt=\"\" width=\"327\" height=\"200\" class=\"aligncenter size-full wp-image-6620\" \/><\/p>\n<p>\u3053\u306e\u3068\u304d\u30013\u3064\u306e\u76f4\u7dda\u306f\u4e00\u70b9\u3067\u4ea4\u308f\u308a\u307e\u3059\u3002\u3053\u306e\u70b9\u3092<span style=\"color: #ff0000;\">\u5782\u5fc3<\/span>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p>\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u306e\u4e2d\u3067\u306f\u3001\u4e09\u89d2\u5f62\u306e\u5782\u5fc3\u306f\u91cd\u8981\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5782\u5fc3\u3092\u5229\u7528\u3057\u3066\u554f\u984c\u3092\u89e3\u304f\u30b1\u30fc\u30b9\u306f\u5c11\u306a\u3044\u3067\u3059\u3002\u305f\u3060\u3001\u5782\u5fc3\u306e\u610f\u5473\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u4e09\u89d2\u5f62\u306e\u5782\u5fc3\u3092\u901a\u308b\u76f4\u7dda\u3067\u306f\u3001\u8fba\u3068\u4ea4\u308f\u308b\u90e8\u5206\u306f\u5fc5\u305a\u76f4\u89d2\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u306e\u5b9a\u7406\uff1a\u4e09\u89d2\u5f62\u306e\u5185\u63a5\u5186<\/h3>\n<p>\u6b21\u306b\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u3092\u5b66\u3073\u307e\u3057\u3087\u3046\u3002\u4e09\u89d2\u5f62\u306b\u5fc5\u305a\u5916\u63a5\u5186\u304c\u3042\u308b\u306e\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u3059\u3079\u3066\u306e\u4e09\u89d2\u5f62\u306f\u5185\u63a5\u5186\u3092\u3082\u3061\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u4e09\u89d2\u5f62\u306e\u5185\u5074\u306b\u5186\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/kejf8.jpg\" alt=\"\" width=\"324\" height=\"198\" class=\"aligncenter size-full wp-image-6621\" \/><\/p>\n<p>\u5185\u63a5\u5186\u306e\u4e2d\u5fc3\u3092\u70b9O\u3068\u3057\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u3001<span style=\"color: #0000ff;\">\u4e09\u89d2\u5f62\u306e\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306f\u5fc5\u305a\u70b9O\u3092\u901a\u308a\u307e\u3059\u3002<\/span>\u5185\u63a5\u5186\u3092\u57fa\u6e96\u306b\u3059\u308b\u3068\u3001\u70b9O\u306f\u5186\u306e\u4e2d\u5fc3\u3067\u3059\u3002\u4e00\u65b9\u3067\u4e09\u89d2\u5f62\u3092\u57fa\u6e96\u306b\u3059\u308b\u3068\u3001\u70b9O\u3092<span style=\"color: #ff0000;\">\u5185\u5fc3<\/span>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u70b9O\u306f\u5186\u306e\u4e2d\u5fc3\u3067\u3042\u308b\u305f\u3081\u3001\u5185\u5fc3\u304b\u3089\u8fba\u306b\u5bfe\u3057\u3066\u5782\u76f4\u306b\u7dda\u3092\u5f15\u304f\u5834\u5408\u3001\u3059\u3079\u3066\u306e\u8fba\u306e\u9577\u3055\u306f\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\/kejf9.jpg\" alt=\"\" width=\"326\" height=\"199\" class=\"aligncenter size-full wp-image-6622\" \/><\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u3092\u5229\u7528\u3057\u3066\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u554f\u984c\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>AB=6\u3001BC=5\u3001AC=4\u306e\u25b3ABC\u304c\u3042\u308a\u307e\u3059\u3002\u70b9O\u304c\u25b3ABC\u306e\u5185\u5fc3\u306e\u5834\u5408\u3001AO:OD\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\/kejf10.jpg\" alt=\"\" width=\"325\" height=\"291\" class=\"aligncenter size-full wp-image-6623\" \/><\/p>\n<p>\u70b9O\u304c\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u3067\u3042\u308b\u305f\u3081\u3001\u2220BAD=\u2220CAD\u3067\u3059\u3002\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u5b9a\u7406\u3088\u308a\u3001AB:AC=BD:DC\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001BD:DC=6:4=3:2\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u7d50\u679c\u3088\u308a\u3001BD\u306e\u9577\u3055\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002BD:DC=3:2\u3067\u3042\u308b\u305f\u3081\u3001BD=3\u3067\u3059\u3002<\/p>\n<p>\\(BD=5\u00d7\\displaystyle\\frac{3}{5}=3\\)<\/p>\n<p>\u6b21\u306b\u25b3ABD\u306b\u7740\u76ee\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/kejf11.jpg\" alt=\"\" width=\"328\" height=\"293\" class=\"aligncenter size-full wp-image-6624\" \/><\/p>\n<p>\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u306e\u5b9a\u7406\u3088\u308a\u3001\u2220ABO=\u2220DBO\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u5b9a\u7406\u3088\u308a\u3001BA:BD=AO:OD\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u7b54\u3048\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(BA:BD=6:3=2:1\\)\\(=AO:OD\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001AO:OD=2:1\u3067\u3042\u308b\u3068\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u4e09\u89d2\u5f62\u306e\u5185\u5fc3\u306e\u5b9a\u7406\u306b\u52a0\u3048\u3066\u3001\u89d2\u306e\u4e8c\u7b49\u5206\u7dda\u306e\u5b9a\u7406\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u4eca\u56de\u306e\u554f\u984c\u306e\u7b54\u3048\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u4e09\u89d2\u5f62\u306e\u91cd\u5fc3\u306e\u5b9a\u7406\uff1a2:1\u306b\u5185\u5206\u3059\u308b\u70b9<\/h3>\n<p>\u4e09\u89d2\u5f62\u3067\u91cd\u5fc3\u3092\u5229\u7528\u3059\u308b\u5b9a\u7406\u306f\u91cd\u8981\u3067\u3059\u3002\u9802\u70b9\u304b\u3089\u8fba\u306e\u4e2d\u70b9\u306b\u5bfe\u3057\u3066\u7dda\u3092\u5f15\u304f\u3068\u304d\u30013\u70b9\u304c\u4ea4\u308f\u308b\u70b9\u3092<span style=\"color: #ff0000;\">\u91cd\u5fc3<\/span>\u3068\u3044\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u70b9\u304c\u91cd\u5fc3\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/kejf13.jpg\" alt=\"\" width=\"328\" height=\"200\" class=\"aligncenter size-full wp-image-6630\" \/><\/p>\n<p><span style=\"color: #0000ff;\">\u91cd\u5fc3\u3092\u901a\u308b\u7dda\u3068\u3044\u3046\u306e\u306f\u3001\u7dda\u306e\u6bd4\u304c\u5fc5\u305a2:1\u306b\u306a\u308a\u307e\u3059\u3002<\/span>\u3053\u308c\u3092\u4e09\u89d2\u5f62\u306e\u91cd\u5fc3\u306e\u5b9a\u7406\u3068\u3044\u3044\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u91cd\u5fc3\u3092\u5229\u7528\u3057\u305f\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u554f\u984c\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\u70b9O\u306f\u25b3ABC\u306e\u91cd\u5fc3\u3067\u3059\u3002\u25b3OBD\u306e\u9762\u7a4d\u304c4\u306e\u5834\u5408\u3001\u25b3ABC\u306e\u9762\u7a4d\u306f\u3044\u304f\u3089\u3067\u3057\u3087\u3046\u304b\u3002<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jfhws1.jpg\" alt=\"\" width=\"325\" height=\"226\" class=\"aligncenter size-full wp-image-6640\" \/><\/p>\n<p>\u524d\u8ff0\u306e\u901a\u308a\u3001\u91cd\u5fc3\u3092\u901a\u308b\u76f4\u7dda\u306f\u8fba\u3092\u4e8c\u7b49\u5206\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001BD\u30922\u500d\u3059\u308b\u3068BC\u306b\u306a\u308a\u307e\u3059\u3002\u9ad8\u3055\u306f\u540c\u3058\u3067\u3042\u308b\u3082\u306e\u306e\u3001\u6a2a\u306e\u9577\u3055\u304c\u4e8c\u500d\u306b\u306a\u308b\u305f\u3081\u3001\u25b3OBC\u306e\u9762\u7a4d\u306f8\u3067\u3059\u3002<\/p>\n<p>\\(\u25b3OBC=4\u00d72=8\\)<\/p>\n<p>\u307e\u305f\u70b9O\u306f\u91cd\u5fc3\u306a\u306e\u3067\u3001AO:OD=2:1\u3067\u3059\u3002\u3064\u307e\u308a\u3001AD:OD=3:1\u3067\u3059\u3002\u25b3OBC\u3068\u25b3ABC\u3092\u6bd4\u3079\u308b\u3068\u3001\u6a2a\u306e\u9577\u3055\u306f\u540c\u3058\u3067\u3042\u308b\u3082\u306e\u306e\u3001\u25b3ABC\u306f3\u500d\u306e\u9ad8\u3055\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u25b3ABC\u306e\u9762\u7a4d\u306f24\u3067\u3059\u3002<\/p>\n<p>\\(\u25b3ABC=8\u00d73=24\\)<\/p>\n<h3>\u4e2d\u7dda\u5b9a\u7406\uff08\u30d1\u30c3\u30d7\u30b9\u306e\u5b9a\u7406\uff09\uff1a\u4e2d\u70b9\u3092\u5229\u7528\u3059\u308b\u5b9a\u7406<\/h3>\n<p>\u4e09\u89d2\u5f62\u306e\u9802\u70b9\u3068\u8fba\u306e\u4e2d\u70b9\u3092\u7d50\u3093\u3060\u7dda\u306b\u95a2\u3059\u308b\u5b9a\u7406\u3068\u3057\u3066<span style=\"color: #ff0000;\">\u4e2d\u7dda\u5b9a\u7406\uff08\u30d1\u30c3\u30d7\u30b9\u306e\u5b9a\u7406\uff09<\/span>\u304c\u3042\u308a\u307e\u3059\u3002\u99b4\u67d3\u307f\u306e\u8584\u3044\u5b9a\u7406\u3067\u306f\u3042\u308b\u3082\u306e\u306e\u3001\u4e2d\u7dda\u5b9a\u7406\u3092\u77e5\u3063\u3066\u3044\u308c\u3070\u3001\u56f3\u5f62\u306e\u554f\u984c\u304c\u51fa\u3055\u308c\u305f\u3068\u304d\u306b\u89e3\u7b54\u6642\u9593\u3092\u5927\u5e45\u306b\u77ed\u7e2e\u3067\u304d\u308b\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u25b3ABC\u306b\u3064\u3044\u3066\u3001\u8fbaBC\u306e\u4e2d\u70b9\u3092D\u3068\u3059\u308b\u3068\u304d\u3001\u4ee5\u4e0b\u306e\u95a2\u4fc2\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/05\/jfhws2.jpg\" alt=\"\" width=\"600\" height=\"295\" class=\"aligncenter size-full wp-image-6641\" \/><\/p>\n<p>BD=CD\u306a\u306e\u3067\u3001\\(AB^2+AC^2\\)\\(=2(AD^2+CD^2)\\)\u3082\u6210\u308a\u7acb\u3061\u307e\u3059\u3002\u8981\u306f\u300c\u8fba\u306e\u9577\u3055\u3092\u4e8c\u4e57\u3057\u3066\u8db3\u3059\u5834\u5408\u3001\u4e2d\u7dda\u306e\u4e8c\u4e57\u3068\u5e95\u8fba\u306e\u534a\u5206\u306e\u4e8c\u4e57\u3092\u8db3\u3057\u30012\u500d\u3059\u308b\u3068\u540c\u3058\u5024\u306b\u306a\u308b\u300d\u3068\u899a\u3048\u307e\u3057\u3087\u3046\u3002\u306a\u304a\u3001\u4e2d\u7dda\u5b9a\u7406\u306f\u4e09\u5e73\u65b9\u306e\u5b9a\u7406\u3084\u4f59\u5f26\u5b9a\u7406\u3001\u30d9\u30af\u30c8\u30eb\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u5229\u7528\u3057\u3066\u8a3c\u660e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u4e2d\u7dda\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u554f\u984c\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\u25b3ABC\u306b\u3064\u3044\u3066\u3001\u70b9D\u306fBC\u306e\u4e2d\u70b9\u3067\u3059\u3002AB=5\u3001AC=3\u3001\u2220BAC=60\u00b0\u306e\u3068\u304d\u3001AD\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\/jfhws3.jpg\" alt=\"\" width=\"326\" height=\"227\" class=\"aligncenter size-full wp-image-6642\" \/><\/p>\n<p>2\u8fba\u306e\u9577\u3055\u3068\u89d2\u5ea6\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u4f59\u5f26\u5b9a\u7406\u3092\u5229\u7528\u3057\u3066BC\u306e\u9577\u3055\u3092\u51fa\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(BC^2=AB^2+AC^2\\)\\(-2AB\u00d7AC\u00d7cos60\u00b0\\)<\/p>\n<p>\\(=25+9-30\u00d7\\displaystyle\\frac{1}{2}\\)<\/p>\n<p>\\(=19\\)<\/p>\n<p>\\(BC&gt;0\\)\u306a\u306e\u3067\u3001\\(BC=\\sqrt{19}\\)\u3067\u3059\u3002\u307e\u305f\u70b9D\u306fBC\u306e\u4e2d\u70b9\u306a\u306e\u3067\u3001\\(BD=\\displaystyle\\frac{\\sqrt{19}}{2}\\)\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306b\u3001\u4e2d\u7dda\u5b9a\u7406\u3092\u7528\u3044\u3066AD\u306e\u9577\u3055\u3092\u51fa\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(AB^2+AC^2=2(AD^2+BD^2)\\)<\/p>\n<p>\\(25+9=2(AD^2+\\displaystyle\\frac{19}{4})\\)<\/p>\n<p>\\(34=2AD^2+\\displaystyle\\frac{19}{2})\\)<\/p>\n<p>\\(4AD^2=68-19\\)<\/p>\n<p>\\(AD^2=\\displaystyle\\frac{49}{4}\\)<\/p>\n<p>\\(AD=\\displaystyle\\frac{7}{2}\\)\\((AD&gt;0)\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(AD=\\displaystyle\\frac{7}{2}\\)\u304c\u7b54\u3048\u3068\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<h2>\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u3092\u899a\u3048\u3001\u8fba\u306e\u9577\u3055\u3084\u6bd4\u3092\u8a08\u7b97\u3059\u308b<\/h2>\n<p>\u6700\u3082\u91cd\u8981\u306a\u56f3\u5f62\u306e\u4e00\u3064\u304c\u4e09\u89d2\u5f62\u3067\u3059\u3002\u9ad8\u6821\u6570\u5b66\u3067\u306f\u3001\u4e09\u89d2\u5f62\u306e\u6027\u8cea\u3092\u899a\u3048\u3066\u3044\u306a\u3044\u3068\u554f\u984c\u3092\u89e3\u3051\u306a\u3044\u5834\u5408\u304c\u591a\u3044\u3067\u3059\u3002\u305d\u3053\u3067\u3001\u3053\u3053\u307e\u3067\u89e3\u8aac\u3057\u305f5\u3064\u306e\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u3092\u3059\u3079\u3066\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e09\u89d2\u5f62\u306b\u306f\u5916\u5fc3\u3084\u5782\u5fc3\u3001\u5185\u5fc3\u3001\u91cd\u5fc3\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u6027\u8cea\u304c\u7570\u306a\u308b\u305f\u3081\u3001\u3069\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308b\u306e\u304b\u628a\u63e1\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u4e2d\u7dda\u5b9a\u7406\u3092\u899a\u3048\u3066\u3044\u308b\u3068\u3001\u8a08\u7b97\u304c\u697d\u306b\u306a\u308b\u5834\u9762\u304c\u591a\u3005\u3042\u308a\u307e\u3059\u3002\u4e2d\u7dda\u5b9a\u7406\u3092\u5229\u7528\u3067\u304d\u308b\u5834\u5408\u3001\u7a4d\u6975\u7684\u306b\u6d3b\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u3092\u899a\u3048\u308b\u306e\u306f\u91cd\u8981\u3067\u3059\u3002\u5916\u5fc3\u3084\u5782\u5fc3\u3001\u5185\u5fc3\u3001\u91cd\u5fc3\u304c\u4f55\u3092\u610f\u5473\u3057\u3066\u3044\u308b\u306e\u304b\u7406\u89e3\u3057\u3001\u4e2d\u7dda\u5b9a\u7406\u3092\u542b\u3081\u3066\u305d\u308c\u305e\u308c\u306e\u5b9a\u7406\u306e\u6027\u8cea\u3092\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9ad8\u6821\u6570\u5b66\u3067\u5b66\u3076\u5185\u5bb9\u306e\u4e00\u3064\u306b\u4e09\u89d2\u5f62\u306e\u5b9a\u7406\u304c\u3042\u308a\u307e\u3059\u3002\u4e09\u89d2\u5f62\u306b\u306f\u5fc5\u305a\u5916\u63a5\u5186\u3084\u5185\u63a5\u5186\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u4e09\u89d2\u5f62\u306b\u306f\u5782\u5fc3\u3084\u91cd\u5fc3\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6027\u8cea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u8fba\u306e\u9577\u3055\u3092\u8a08\u7b97\u3057\u305f\u308a\u3001\u8a3c\u660e\u554f\u984c\u3092\u89e3\u3044\u305f\u308a\u3059\u308b\u306e\u3067\u3059\u3002 \u305f\u3060 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