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background-color: #f3f3f3; color: #333;\">\n<div class=\"sc_frame_text\">\u3053\u308c\u304c\u3057\u3063\u304b\u308a\u3057\u306a\u3044\u307e\u307e\u9032\u3093\u3067\u3057\u307e\u3046\u3068\uff0c\u307b\u3068\u3093\u3069\u306e\u4eba\u304c1\u9031\u9593\u5f8c\u306b\u306f\u89e3\u304d\u65b9\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u3066\u7b54\u3048\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/div>\n<\/div>\n<\/div>\n<p>\u3053\u308c\u3067\u306f\u3069\u3093\u306a\u306b\u4e00\u751f\u61f8\u547d\u6642\u9593\u3092\u4f7f\u3063\u3066\u9811\u5f35\u3063\u3066\u3082\uff0c\u5b9a\u671f\u8a66\u9a13\u3067\u306f\u305d\u308c\u306a\u308a\u306e\u7d50\u679c\u304c\u51fa\u3066\u3057\u307e\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u5165\u8a66\u3067\u306f\u7bc4\u56f2\u304c\u5e83\u3059\u304e\u3066\u5230\u5e95\u592a\u5200\u6253\u3061\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<h4 class=\"sc_heading headtag custom\" style=\"color: #ffffff; background-color: #01297a; border-color: #01297a;\"><span class=\"sc_title\">\u4ed6\u4eba\u306b\u8aac\u660e\u3067\u304d\u308b\u30ec\u30d9\u30eb\u3067\u81ea\u5206\u306e\u4e2d\u306b\u6eb6\u3051\u8fbc\u307e\u305b\u308b<\/span><\/h4>\n<p>\u5927\u5207\u306a\u306e\u306f\u300c\u305d\u306e\u554f\u984c\u306e\u89e3\u304d\u65b9\u3092\u899a\u3048\u308b\u3053\u3068\u300d\u3067\u306f\u306a\u304f\uff0c\u300c\u305d\u306e\u554f\u984c\u306f\u306a\u305c\u305d\u306e\u3088\u3046\u306b\u89e3\u304f\u306e\u304b\u3092\u4ed6\u4eba\u306b\u8aac\u660e\u3067\u304d\u308b\u304f\u3089\u3044\u306e\u30ec\u30d9\u30eb\u3067\u81ea\u5206\u306e\u4e2d\u306b\u6eb6\u3051\u8fbc\u307e\u305b\u308b\u3053\u3068\u300d\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u4e00\u554f\u4e00\u554f\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u3051\u3070\uff0c\u305d\u306e\u5206\u91ce\u3060\u3051\u3067\u306a\u304f\u305d\u306e\u5206\u91ce\u3092\u4f7f\u3063\u305f\u878d\u5408\u554f\u984c\u3084\u767a\u5c55\u554f\u984c\uff0c\u3055\u3089\u306b\u306f\u5168\u304f\u95a2\u4fc2\u306a\u3044\u5206\u91ce\u306e\u554f\u984c\u307e\u3067\u81ea\u529b\u3067\u89e3\u3051\u308b\u3088\u3046\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3050\u3093\u3068\u5897\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2 style=\"padding: .25em 0.5em .75em; border-left: 6px solid #3300ff; border-bottom: 1px solid #ccc;\">\u89e3\u3051\u306a\u3044\u554f\u984c\uff0c\u8aac\u660e\u304c\u3067\u304d\u306a\u3044\u554f\u984c\u306e\u6271\u3044\u65b9<\/h2>\n<p><img decoding=\"async\" data-src=\"https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920.jpg\" alt=\"\" width=\"1920\" height=\"1440\" class=\"alignnone wp-image-3914 size-full lazyload\" data-srcset=\"https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920.jpg 1920w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920-300x225.jpg 300w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920-1024x768.jpg 1024w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920-768x576.jpg 768w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920-1536x1152.jpg 1536w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920-280x210.jpg 280w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2020\/08\/geometry-625155_1920-150x112.jpg 150w\" data-sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><br \/>\n\u3067\u306f\u5177\u4f53\u7684\u306b\u3069\u3046\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u6b21\u306e\u554f\u984c\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\n\u7ae0\u672b\u554f\u984c\u306b\u3042\u308b\u304f\u3089\u3044\u306e\u5185\u5bb9\u304c\u542b\u307e\u308c\u305f\u554f\u984c\u3067\u3059\u3002<\/p>\n<div class=\"sc_frame_wrap inline blue\">\n<div class=\"sc_frame_title\"><span class=\"sc_frame_icon\"><i class=\"fa fa-pencil-square-o\" aria-hidden=\"true\"><span>fa-pencil-square-o<\/span><\/i><\/span>\u4f8b\u984c<\/div>\n<div class=\"sc_frame has-bg\">\n<p>\u4e0b\u306e\u56f3\u306e\u306b\u304a\u3044\u3066\uff0cM \u306fAB \u306e\u4e2d\u70b9\u3067\u3042\u308b\u3068\u3059\u308b\u3002\u3053\u306e\u3068\u304d\uff0c\u7b49\u5f0f$$\\rm{OA}^2 + \\rm{OB}^2 =2(\\rm{OM}^2 + \\rm{AM}^2 )$$\u304c\u6210\u308a\u7acb\u3064\u3053\u3068\u3092\u793a\u305b\u3002<br \/>\n<a href=\"https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324.png\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" data-src=\"https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324.png\" alt=\"\" width=\"2796\" height=\"1558\" class=\"aligncenter wp-image-9761 size-full lazyload\" data-srcset=\"https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324.png 2796w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324-300x167.png 300w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324-1024x571.png 1024w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324-768x428.png 768w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324-1536x856.png 1536w, https:\/\/www.educational-lounge.com\/wp-content\/uploads\/2023\/03\/20230324-2048x1141.png 2048w\" data-sizes=\"(max-width: 2796px) 100vw, 2796px\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<p>\u3055\u3066\uff0c\u307e\u305a\u306f\u7686\u3055\u3093\u3053\u306e\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u6a21\u7bc4\u89e3\u7b54\u3092\u8f09\u305b\u307e\u3059\u306e\u3067\uff0c\u89e3\u3051\u308b\u304b\uff0c\u89e3\u3051\u306a\u304f\u3066\u8ae6\u3081\u308b\u304b\u3057\u305f\u3089\u6b21\u306e\u6a21\u7bc4\u89e3\u7b54\u3092\u8ffd\u3044\u304b\u3051\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3 style=\"padding: .25em 0.5em .75em; border-left: 6px solid #3300ff; border-bottom: 1px solid #ccc;\">\u6a21\u7bc4\u89e3\u7b54<\/h3>\n<p>$$\\theta = \\angle\\rm{OMC}$$\u3068\u7f6e\u304f\u3068\uff0c$$\\angle\\rm{OMB} = 180^\\circ \u2212 \\theta$$\u3068\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u3053\u3053\u3067$\\triangle{\\rm{OAM}}$\u306b\u304a\u3044\u3066\u4f59\u5f26\u5b9a\u7406\u3088\u308a$$\\rm{OA}^2 = \\rm{OM}^2 + \\rm{AM}^2 \u2212 2 \u00b7 \\rm{OM} \u00b7 \\rm{AM} \u00b7 \\rm{cos}\\theta \u00b7 \u00b7 \u00b7\u2460$$\u3068\u66f8\u3051\u308b\u3002\u307e\u305f\uff0c$\\triangle{\\rm{OMB}}$\u306b\u304a\u3044\u3066\u4f59\u5f26\u5b9a\u7406\u3088\u308a$$\\rm{OB}^2 = \\rm{OM}^2 + \\rm{BM}^2 \u2212 2 \u00b7 \\rm{OM} \u00b7 \\rm{BM} \u00b7 \\rm{cos}(180^\\circ \u2212 \\theta) \u00b7 \u00b7 \u00b7\u2461$$\u3068\u3082\u66f8\u3051\u308b\u3002\u3053\u3053\u3067\uff0c$$\\rm{cos}(180^\\circ \u2212 \\theta) = \u2212 \\rm{cos}\\theta$$\u3067\u3042\u308b\u3053\u3068\u3068\uff0c$$\\rm{BM} = \\rm{AM}$$\u3067\u3042\u308b\u3053\u3068\u3068\u304b\u3089\uff0c$\u2461$\u306f$$\\rm{OB}^2 = \\rm{OM}^2 + \\rm{AM}^2 + 2 \u00b7 \\rm{OM} \u00b7 \\rm{AM} \u00b7 \\rm{cos} \\theta \u00b7 \u00b7 \u00b7 \u2461'$$\u3068\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002$\u2460$\u3068$\u2461'$\u3092\u52a0\u3048\u308b\u3053\u3068\u306b\u3088\u308a\uff0c\u7b49\u5f0f$$\\rm{OA}^2 + \\rm{OB}^2 = 2(\\rm{OM}^2 + \\rm{AM}^2 )$$\u3092\u5f97\u308b\u3002<\/p>\n<h3 style=\"padding: .25em 0.5em .75em; border-left: 6px solid #3300ff; border-bottom: 1px solid #ccc;\">\u3053\u306e\u554f\u984c\u304b\u3089\u4f55\u3092\u5b66\u3076\u304b<\/h3>\n<p>\u89e3\u3051\u306a\u304b\u3063\u305f\u4eba\u306f\u3053\u306e\u6a21\u7bc4\u89e3\u7b54\u3092\u5199\u3057\u3066\u7d42\u308f\u308b\u3053\u3068\u306e\u306a\u3044\u3088\u3046\u306b\uff08\u7b11\uff09\u3002<\/p>\n<p>\u3053\u306e\u554f\u984c\u306f\u305f\u304f\u3055\u3093\u306e\u57fa\u672c\u4e8b\u9805\u3092\u8981\u6c42\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u8a3c\u660e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u305f\u4eba\u306f\uff0c\u4ee5\u4e0b\u306e3 \u3064\u306e\u30dd\u30a4\u30f3\u30c8\u306f\u610f\u8b58\u3067\u304d\u3066\u3044\u305f\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<div class=\"sc_frame_wrap inline orange\">\n<div class=\"sc_frame_title\"><span class=\"sc_frame_icon\"><i class=\"fa fa-lightbulb-o\" aria-hidden=\"true\"><span>fa-lightbulb-o<\/span><\/i><\/span>\u3053\u306e\u554f\u984c\u3067\u78ba\u8a8d\u3059\u3079\u304d\u30dd\u30a4\u30f3\u30c8<\/div>\n<div class=\"sc_frame has-bg\">\n<div class=\"sc_designlist ul fa_angle_d black\">\n<ul>\n<li>\u4f59\u5f26\u5b9a\u7406\u3092\u4f7f\u3048\u308b\u304b\u3002<\/li>\n<li>$\\rm{cos} (180^\\circ \u2212 \\theta) = \u2212 \\rm{cos} \\theta$\u306e\u5909\u5f62\u304c\u3067\u304d\u305f\u304b\u3002<\/li>\n<li>\u548c\u304c$180^\\circ$\u306b\u306a\u308b\uff12\u3064\u306e\u89d2\u306e\u30da\u30a2\u3092\u898b\u305f\u3089\u4f59\u5f26\u5b9a\u7406\u306e\u5f0f\u3092\uff12\u672c\u7acb\u3066\u3066\u307f\u308b\u3068\u3044\u3046\u5b9a\u8de1\u3092\u77e5\u3063\u3066\u3044\u308b\u304b\u3002<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<h4 class=\"sc_heading headtag custom\" style=\"color: #ffffff; background-color: #01297a; border-color: #01297a;\"><span class=\"sc_title\">\u57fa\u672c\u7684\u306a\u77e5\u8b58\u304c\u8eab\u306b\u3064\u3044\u3066\u3044\u308b\u304b<\/span><\/h4>\n<p>\u6700\u521d\u306e\u3075\u305f\u3064\u306f\u672c\u5f53\u306b\u57fa\u672c\u7684\u306a\u77e5\u8b58\u306e\u78ba\u8a8d\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u304c\u3067\u304d\u3066\u6e80\u8db3\u3059\u308b\u306e\u3067\u306f\u306a\u304f\uff0c\u300c\u4f59\u5f26\u5b9a\u7406\u3060\u3051\u3067\u306a\u304f\u6b63\u5f26\u5b9a\u7406\u306f\u899a\u3048\u3066\u3044\u308b\u3060\u308d\u3046\u304b\u300d\u3084\u300c$\\rm{cos}$\u3060\u3051\u3067\u306a\u304f$\\rm{sin}$\u306f\u5927\u4e08\u592b\u3060\u308d\u3046\u304b\u300d\u306a\u3069\uff0c\u5468\u8fba\u306e\u78ba\u8a8d\u3082\u3059\u308b\u3068\u306a\u304a\u52b9\u679c\u7684\u3067\u3059\u3002<\/p>\n<h4 class=\"sc_heading headtag custom\" style=\"color: #ffffff; background-color: #01297a; border-color: #01297a;\"><span class=\"sc_title\">\u56f3\u5f62\u304c\u5909\u308f\u3063\u3066\u3082\u5229\u7528\u3067\u304d\u308b\u304b<\/span><\/h4>\n<p>\u305d\u3057\u3066\uff13\u3064\u76ee\u306f\uff0c\u4f8b\u984c\u3084\u7df4\u7fd2\u554f\u984c\u3067\u8eab\u306b\u3064\u3051\u308b\u3079\u304d\u4f8b\u984c\u304c\uff0c\u56f3\u5f62\u304c\u5909\u308f\u3063\u3066\u3082\u5229\u7528\u3067\u304d\u308b\u304b\u306b\u3064\u3044\u3066\u306e\u78ba\u8a8d\u3067\u3059\u3002<\/p>\n<div class=\"sc_frame_wrap solid custom\">\n<div class=\"sc_frame \" style=\"border-color: #f3f3f3; background-color: #f3f3f3; color: #333;\">\n<div class=\"sc_frame_text\">\u3053\u306e\u6280\u8853\u306f\u9055\u3046\u56f3\u5f62\u3067\u5fc5\u305a\u53d6\u308a\u6271\u3063\u3066\u3044\u308b\u306f\u305a\u3067\u3059\u3002<br \/>\n\u5186\u306b\u5185\u63a5\u3059\u308b\u56db\u89d2\u5f62\u306e\u5bfe\u89d2\u7dda\u306e\u9577\u3055\u3092\u8a08\u7b97\u3059\u308b\u3068\u304d\u5168\u304f\u540c\u3058\u3053\u3068\u3092\u3057\u307e\u3059\u3057\uff0c\u3053\u306e\u56f3\u5f62\u306b\u95a2\u3057\u3066\u306f\u30bb\u30f3\u30bf\u30fc\u8a66\u9a13\u3067\u306f\u983b\u51fa\u3067\u3057\u305f\u3002<\/div>\n<\/div>\n<\/div>\n<p>\u305d\u306e\uff12\u3064\u306e\u89d2\u5ea6\u304c\u6a2a\u306b\u4e26\u3093\u3067\u3044\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u56f3\u304c\u5927\u4e8b\u306a\u306e\u3067\u306f\u306a\u304f\uff0c\u300c\u548c\u304c$180^\\circ$ \u3067\u3042\u308b\u3068\u3044\u3046\u4e8b\u5b9f\u300d\u304c\u5927\u4e8b\u306a\u3093\u3067\u3059\u3002<br \/>\n\u3053\u308c\u304c\u8eab\u306b\u3064\u3044\u3066\u3044\u308c\u3070\u521d\u898b\u3067\u3082\u89e3\u7b54\u53ef\u80fd\u306a\u554f\u984c\u3067\u3057\u305f\u3002<\/p>\n<h3 style=\"padding: .25em 0.5em .75em; border-left: 6px solid #3300ff; border-bottom: 1px solid #ccc;\">\u91cd\u8981\u306a\u306e\u306f\u305d\u306e\u554f\u984c\u3092\u4ed6\u306e\u300c\u898b\u305f\u3053\u3068\u304c\u306a\u3044\u554f\u984c\u300d\u306b\u6d3b\u304b\u305b\u308b\u3088\u3046\u306b\u306a\u308b\u3053\u3068<\/h3>\n<p>\u3053\u306e\u3088\u3046\u306a\u30dd\u30a4\u30f3\u30c8\u304c\u982d\u306e\u4e2d\u3067\u3057\u3063\u304b\u308a\u3068\u6574\u7406\u3055\u308c\u3066\u3044\u308c\u3070\uff0c\u4e0a\u306e\u3088\u3046\u306a\u89e3\u7b54\u304c\u304b\u306a\u308a\u81ea\u7136\u306b\u51fa\u3066\u304f\u308b\u3088\u3046\u306b\u306a\u308b\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<div class=\"sc_frame_wrap solid custom\">\n<div class=\"sc_frame \" style=\"border-color: #f3f3f3; background-color: #f3f3f3; color: #333;\">\n<div class=\"sc_frame_text\">\u4e00\u554f\u4e00\u554f\u3053\u306e\u304f\u3089\u3044\u306e\u5bc6\u5ea6\u3067\u5b66\u7fd2\u3057\u3066\u3044\u304b\u306a\u3044\u3068\uff0c\u5165\u8a66\u306f\u304a\u308d\u304b\u5b9a\u671f\u8a66\u9a13\u306e\u5bfe\u7b56\u3067\u3082\u8a66\u9a13\u672c\u756a\u3067\u30c9\u5fd8\u308c\u3057\u3066\u3057\u307e\u3048\u3070\uff10\u70b9\u306b\u307e\u3063\u3057\u3050\u3089\u3067\u3059\u3002<\/div>\n<\/div>\n<\/div>\n<p>\u5927\u4e8b\u306a\u306e\u306f\u305d\u306e\u554f\u984c\u304c\u89e3\u3051\u308b\u3053\u3068\u3092\u30b4\u30fc\u30eb\u306b\u3059\u308b\u3053\u3068\u3067\u306f\u306a\u304f\uff0c\u305d\u306e\u554f\u984c\u3092\u89e3\u304f\u80fd\u529b\u3092\u3044\u304b\u306b\u4ed6\u306e\u898b\u305f\u3053\u3068\u306e\u306a\u3044\u554f\u984c\u306b\u6d3b\u304b\u305b\u308b\u3088\u3046\u306b\u306a\u308b\u304b\u306a\u306e\u3067\u3059\u3002<\/p>\n<h2 style=\"padding: .25em 0.5em .75em; 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