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class=\"aligncenter size-full wp-image-3139\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/01\/etj4-1.jpg\" alt=\"\" width=\"241\" height=\"272\" \/><\/p>\n<p>\u8a3c\u660e\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u25b3ABD\u3068\u25b3ACD\u306b\u3064\u3044\u3066<\/li>\n<li>AB\uff1dAC\uff1a\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u306e\u5b9a\u7fa9\u3088\u308a &#8211; \u2460<\/li>\n<li>BD\uff1dCD\uff1a\u70b9D\u306fBC\u306e\u4e2d\u70b9 &#8211; \u2461<\/li>\n<li>AD\uff1dAD\uff1a\u5171\u901a\u306e\u7dda &#8211; \u2462<\/li>\n<li class=\"odd\">\u2460\u3001\u2461\u3001\u2462\u3088\u308a\u30013\u7d44\u306e\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044\u305f\u3081\u3001\u25b3ABD\u2261\u25b3ACD<\/li>\n<li>\u25b3ABD\u2261\u25b3ACD\u306a\u306e\u3067\u3001\u2220B\uff1d\u2220C<\/li>\n<\/ul>\n<p><span style=\"color: #0000ff;\">\u4e09\u89d2\u5f62\u304c\u5408\u540c\u3067\u3042\u308b\u3068\u8a3c\u660e\u3059\u308b\u3053\u3068\u3067\u3001\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u306e\u5e95\u89d2\u304c\u7b49\u3057\u3044\u3068\u8a3c\u660e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/span>\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u3060\u30682\u3064\u306e\u8fba\u304c\u7b49\u3057\u3044\u3068\u540c\u6642\u306b\u3001\u5fc5\u305a\u5e95\u89d2\u304c\u7b49\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u6027\u8cea\u3068\u659c\u8fba<\/h2>\n<p>\u307e\u305f\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u306e\u6027\u8cea\u3068\u540c\u6642\u306b\u5b66\u3070\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u7279\u6b8a\u306a\u4e09\u89d2\u5f62\u304c\u76f4\u89d2\u4e09\u89d2\u5f62\u3067\u3059\u3002\u4e09\u89d2\u5f62\u306e\u4e2d\u306b90\u00b0\u306e\u89d2\u5ea6\u304c\u3042\u308b\u5834\u5408\u3001\u305d\u306e\u4e09\u89d2\u5f62\u306f\u76f4\u89d2\u4e09\u89d2\u5f62\u3068\u547c\u3070\u308c\u307e\u3059\u3002<\/p>\n<p>\u76f4\u89d2\u4e09\u89d2\u5f62\u306b\u306f\u659c\u8fba\u3068\u3044\u3046\u8a00\u8449\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u4e09\u89d2\u5f62\u306b\u306f\u659c\u8fba\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u305f\u3060\u76f4\u89d2\u4e09\u89d2\u5f62\u306f\u7279\u6b8a\u306a\u4e09\u89d2\u5f62\u3067\u3042\u308b\u305f\u3081\u3001\u659c\u8fba\u3092\u5229\u7528\u3057\u3066\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u6027\u8cea\u3092\u8aac\u660e\u3057\u307e\u3059\u3002\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u659c\u8fba\u306f\u4ee5\u4e0b\u306e\u90e8\u5206\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3140\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/01\/etj5.jpg\" alt=\"\" width=\"263\" height=\"117\" \/><\/p>\n<p>90\u00b0\u306e\u89d2\u5ea6\u3092\u3082\u3064\u4e09\u89d2\u5f62\u304c\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5b9a\u7fa9\u3067\u3059\u3002\u307e\u305f\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5834\u5408\u3001\u659c\u8fba\u306b\u52a0\u3048\u3066\u92ed\u89d2\u304c2\u3064\u3042\u308a\u307e\u3059\u3002<span style=\"color: #ff0000;\">90\u00b0\u3088\u308a\u3082\u5c0f\u3055\u3044\u89d2\u5ea6\u3092\u92ed\u89d2\u3068\u3044\u3044\u307e\u3059\u3002<\/span>\u76f4\u89d2\u4e09\u89d2\u5f62\u3067\u306f\u300190\u00b0\u3067\u306f\u306a\u30442\u3064\u306e\u89d2\u5ea6\u306f\u5fc5\u305a\u92ed\u89d2\u3067\u3059\u3002<\/p>\n<h3>\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6<\/h3>\n<p>\u91cd\u8981\u306a\u306e\u306f\u3001\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u306b\u52a0\u3048\u3066\u76f4\u89d2\u4e09\u89d2\u5f62\u306b\u306f\u72ec\u81ea\u306e\u5408\u540c\u6761\u4ef6\u304c\u3042\u308b\u70b9\u3067\u3059\u3002\u3053\u306e\u3068\u304d\u3001\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u306f\u4ee5\u4e0b\u306e4\u3064\u3067\u3059\u3002<\/p>\n<ul>\n<li class=\"odd\">3\u7d44\u306e\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044<\/li>\n<li class=\"even\">2\u7d44\u306e\u8fba\u3068\u305d\u306e\u9593\u306e\u89d2\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044<\/li>\n<li class=\"odd\">1\u7d44\u306e\u8fba\u3068\u305d\u306e\u4e21\u7aef\u306e\u89d2\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044<\/li>\n<li class=\"even\">2\u7d44\u306e\u89d2\u3068\u305d\u306e\u9593\u306b\u306a\u30441\u7d44\u306e\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044<\/li>\n<\/ul>\n<p>\u203b\u65e5\u672c\u3067\u306f\u306a\u305c\u304b\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3068\u3057\u3066\u300c2\u7d44\u306e\u89d2\u3068\u305d\u306e\u9593\u306b\u306a\u30441\u7d44\u306e\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044\u300d\u3092\u5b66\u3073\u307e\u305b\u3093\u3002\u305f\u3060\u3001<span style=\"color: #0000ff;\">\u4e16\u754c\u3067\u306f\u5408\u540c\u6761\u4ef64\u3064\u3059\u3079\u3066\u3092\u5b66\u3076\u306e\u304c\u57fa\u672c\u3067\u3059\u3002<\/span><\/p>\n<p>\u3053\u308c\u306b\u52a0\u3048\u3066\u3001\u76f4\u89d2\u4e09\u89d2\u5f62\u3060\u3051\u306b\u5b58\u5728\u3059\u308b\u5408\u540c\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u304c\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u659c\u8fba\u3068\u4ed6\u306e\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3767\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/01\/trrw1.jpg\" alt=\"\" width=\"500\" height=\"212\" \/><\/p>\n<p><span style=\"color: #ff0000;\">\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u306f\u5168\u90e8\u30675\u3064\u3067\u3059\u3002<\/span>\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u306b\u52a0\u3048\u3066\u3001\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3092\u899a\u3048\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>\u30fb\u659c\u8fba\u30681\u3064\u306e\u92ed\u89d2\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044<\/strong><\/p>\n<p>\u306a\u304a\u3001\u65e5\u672c\u3067\u306f\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3068\u3057\u3066\u300c\u659c\u8fba\u30681\u3064\u306e\u92ed\u89d2\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044\u300d\u3082\u5b66\u3073\u307e\u3059\u3002\u305f\u3060\u3001\u3053\u308c\u306f\u300c2\u7d44\u306e\u89d2\u3068\u305d\u306e\u9593\u306b\u306a\u30441\u7d44\u306e\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044\u300d\u3068\u610f\u5473\u304c\u540c\u3058\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u672c\u6765\u306f\u300c2\u7d44\u306e\u89d2\u3068\u305d\u306e\u9593\u306b\u306a\u30441\u7d44\u306e\u8fba\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044\u300d\u304c\u6b63\u3057\u3044\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3122\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/01\/iybge3.jpg\" alt=\"\" width=\"600\" height=\"165\" \/><\/p>\n<p>\u3057\u304b\u3057\u3001\u4e00\u5fdc\u306f\u30c6\u30b9\u30c8\u3067\u70b9\u6570\u3092\u53d6\u3089\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001<span style=\"color: #0000ff;\">\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3068\u3057\u3066\u300c\u659c\u8fba\u30681\u3064\u306e\u92ed\u89d2\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044\u300d\u3082\u899a\u3048\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n<p><strong>\u30fb2\u3064\u306e\u89d2\u5ea6\u304c\u7b49\u3057\u3044\u3060\u3051\u3067\u306f\u4e0d\u5341\u5206<\/strong><\/p>\n<p>\u306a\u304a\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3068\u3057\u3066\u30012\u3064\u306e\u89d2\u5ea6\u304c\u7b49\u3057\u3044\u5834\u5408\u306f\u3069\u3046\u306a\u308b\u306e\u304b\u3068\u8003\u3048\u308b\u4eba\u3082\u3044\u307e\u3059\u3002\u305f\u3060\u3053\u306e\u5834\u5408\u3001\u5fc5\u305a\u3057\u30822\u3064\u306e\u76f4\u89d2\u4e09\u89d2\u5f62\u306f\u5408\u540c\u3068\u306f\u3044\u3048\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u5f62\u304c\u7570\u306a\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3142\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/01\/etj8.jpg\" alt=\"\" width=\"600\" height=\"134\" \/><\/p>\n<p>\u89d2\u5ea6\u304c\u7b49\u3057\u3044\u3060\u3051\u3067\u306f\u7d76\u5bfe\u306b\u5408\u540c\u3068\u306f\u3044\u3048\u307e\u305b\u3093\u3002\u4e09\u89d2\u5f62\u306e\u5408\u540c\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3051\u308c\u3070\u3001\u4e09\u89d2\u5f62\u306f\u5408\u540c\u306b\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u7df4\u7fd2\u554f\u984c\uff1a\u56f3\u5f62\u306e\u8a3c\u660e\u554f\u984c<\/h2>\n<p><strong>Q1.<\/strong>\u00a0\u6b21\u306e\u56f3\u5f62\u3092\u8a3c\u660e\u3057\u307e\u3057\u3087\u3046<\/p>\n<p>\u4e0b\u306e\u56f3\u5f62\u306b\u3064\u3044\u3066\u3001\u25b3ABC\u306fAB\uff1dAC\u306e\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u3067\u3059\u3002BD\u22a5AC\u3001CE\u22a5AB\u306e\u3068\u304d\u3001\u25b3BCE\u2261\u25b3CBD\u3092\u8a3c\u660e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3143\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/01\/etj9.jpg\" alt=\"\" width=\"318\" height=\"275\" \/><\/p>\n<p><strong>A1<\/strong>. \u89e3\u7b54<\/p>\n<p>\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u3068\u76f4\u89d2\u4e09\u89d2\u5f62\u306e\u8907\u5408\u554f\u984c\u306f\u983b\u7e41\u306b\u51fa\u3055\u308c\u307e\u3059\u3002\u305d\u3053\u3067\u30012\u3064\u306e\u56f3\u5f62\u306e\u6027\u8cea\u3092\u7406\u89e3\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li class=\"odd\">\u25b3BCE\u3068\u25b3CBD\u306b\u304a\u3044\u3066<\/li>\n<li class=\"even\">\u2220BEC\uff1d\u2220CDB\uff1d90\u00b0\uff1a\u4eee\u8aac\u3088\u308a \u2013 \u2460<\/li>\n<li class=\"odd\">BC\uff1dCB\uff1a\u5171\u901a\u306e\u7dda \u2013 \u2461<\/li>\n<li class=\"even\">\u2220EBC\uff1d\u2220DCB\uff1a\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u306e\u5e95\u89d2\u306f\u7b49\u3057\u3044 \u2013 \u2462<\/li>\n<li class=\"odd\">\u2460\u3001\u2461\u3001\u2462\u3088\u308a\u3001\u659c\u8fba\u30681\u3064\u306e\u92ed\u89d2\u304c\u305d\u308c\u305e\u308c\u7b49\u3057\u3044\u305f\u3081\u3001\u25b3BCE\u2261\u25b3CBD<\/li>\n<\/ul>\n<hr \/>\n<p><strong>Q2.<\/strong>\u00a0\u6b21\u306e\u56f3\u5f62\u3092\u8a3c\u660e\u3057\u307e\u3057\u3087\u3046<\/p>\n<p>\u4e0b\u306e\u56f3\u5f62\u306b\u3064\u3044\u3066\u3001\u25b3ABC\u306f\u2220ABC\uff1d90\u00b0\u306e\u76f4\u89d2\u4e09\u89d2\u5f62\u3067\u3059\u3002\u70b9B\u304b\u3089\u8fbaAC\u306b\u5bfe\u3057\u3066\u3001\u5782\u76f4\u306a\u7ddaBD\u3092\u5f15\u304d\u307e\u3059\u3002\u307e\u305f\u2220BAC\u306e\u4e8c\u7b49\u5206\u7dda\u3092\u5f15\u304d\u3001\u4ea4\u70b9\u3092\u305d\u308c\u305e\u308c\u4ee5\u4e0b\u306e\u3088\u3046\u306bE\u3001F\u3068\u3057\u307e\u3059\u3002BE\uff1dBF\u3092\u8a3c\u660e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3145\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2021\/01\/etj10-1.jpg\" alt=\"\" width=\"322\" height=\"368\" \/><\/p>\n<p><strong>A2<\/strong>. \u89e3\u7b54<\/p>\n<p>\u300c\u8fba\u306e\u9577\u3055\u304c\u540c\u3058\u300d\u3068\u8a3c\u660e\u3059\u308b\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u3044\u304f\u3064\u304b\u5019\u88dc\u304c\u3042\u308a\u307e\u3059\u3002\u6700\u3082\u4e00\u822c\u7684\u306a\u65b9\u6cd5\u306f\u3001\u5408\u540c\u306a\u4e09\u89d2\u5f62\u3092\u898b\u3064\u3051\u308b\u3084\u308a\u65b9\u3067\u3059\u3002\u305f\u3060\u3001\u56f3\u3092\u307f\u308b\u3068\u5408\u540c\u306b\u306a\u308b2\u3064\u306e\u4e09\u89d2\u5f62\u306f\u5b58\u5728\u3057\u306a\u3044\u3088\u3046\u306b\u601d\u3048\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u5225\u306e\u65b9\u6cd5\u306b\u3088\u3063\u3066\u8fba\u306e\u9577\u3055\u304c\u540c\u3058\u3060\u3068\u8a3c\u660e\u3059\u308b\u3053\u3068\u3092\u8003\u3048\u307e\u3057\u3087\u3046\u3002\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u306e\u6027\u8cea\u3068\u3057\u3066\u306f\u30012\u3064\u306e\u8fba\u304c\u7b49\u3057\u304f\u3001\u304b\u3064\u5e95\u89d2\u304c\u7b49\u3057\u3044\u3067\u3059\u3002\u305d\u306e\u305f\u3081<span style=\"color: #0000ff;\">2\u3064\u306e\u89d2\u5ea6\u304c\u540c\u3058\u3060\u3068\u8aac\u660e\u3067\u5207\u308c\u3070\u3001\u305d\u306e\u4e09\u89d2\u5f62\u306f\u4e8c\u7b49\u8fba\u4e09\u89d2\u5f62\u3067\u3042\u308a\u30012\u3064\u306e\u8fba\u306e\u9577\u3055\u304c\u7b49\u3057\u3044\u3068\u5206\u304b\u308a\u307e\u3059\u3002<\/span><\/p>\n<p>\u307e\u305a\u3001\u25b3ABF\u306b\u7740\u76ee\u3057\u307e\u3057\u3087\u3046\u3002\u25b3ABF\u306f\u76f4\u89d2\u4e09\u89d2\u5f62\u3067\u3042\u308a\u3001\u2220AFB\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(\u2220AFB=180\u00b0-90\u00b0-\u2220BAF\\)<\/li>\n<li>\\(\u2220AFB=90\u00b0-\u2220BAF\\)\u00a0&#8211; 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