{"id":2408,"date":"2020-10-14T11:30:18","date_gmt":"2020-10-14T03:30:18","guid":{"rendered":"https:\/\/www.study-together.com\/edu\/?page_id=2408"},"modified":"2020-11-02T14:47:25","modified_gmt":"2020-11-02T06:47:25","slug":"geometry-finding-unkwown-angle-skills","status":"publish","type":"page","link":"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/geometry-finding-unkwown-angle-skills\/","title":{"rendered":"12. \u6f14\u7e79\u63a8\u7406\u5e7e\u4f55 > \u6c42\u672a\u77e5\u89d2\u7684\u6280\u5de7"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2408\" class=\"elementor elementor-2408\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f46ba61 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f46ba61\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-1e14182\" data-id=\"1e14182\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b36ccce elementor-widget elementor-widget-text-editor\" data-id=\"b36ccce\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>12.2.\u00a0\u00a0 \u6c42\u672a\u77e5\u89d2\u7684\u6280\u5de7<\/h2><p>\u9762\u5c0d \u6f14\u7e79\u63a8\u7406\u5e7e\u4f55\uff0c\u5927\u5bb6\u90fd\u4e00\u5b9a\u6709\u8a66\u904e\u7747\u4f4f\u5e45\u5716\u597d\u8010\u90fd\u5514\u77e5\u9ede\u6a23\u5148\u8a08\u5230\u984c\u76ee\u8981\u4f60\u8a08\u5605\u55f0\u96bb\u89d2\u3002<span style=\"color: #ff0000;\">\u4e0d\u904e\u5716\u53ef\u4ee5\u4fc2\u5343\u8b8a\u842c\u5316\uff0c\u4f46\u7576\u4e2d\u6709\u5e7e\u500b\u597d\u91cd\u8981\u5605 \u6c42\u672a\u77e5\u89d2\u7684\u6280\u5de7 \u4fc2\u6c38\u6046\u4e0d\u8b8a\u7684\u3002<\/span>\u5927\u5bb6\u53ea\u8981\u6bcf\u6b21\u90fd\u904b\u7528\uff0c\u505a\u984c\u76ee\u6642\u61c9\u6703\u89ba\u5f97\u5bb9\u6613\u5497\u3002<\/p><h3>12.2.1 \u6280\u5de7\u4e00 : \u6ce8\u610f\u5716\u5f62\u4e2d\u7279\u5225\u5605\u5730\u65b9<\/h3><p>\u6309DSE\ud85e\udc68\u76ee\u4fc2\u5514\u6703\u6709\u5ee2\u8a71\u5605\u539f\u5247\uff0c\u6211\u54cb\u4fc2\u8981\u7528\u6652\u6240\u6709\u984c\u76ee\u4ffe\u6211\u54cb\u5605\u8cc7\u6599\u5148\u53ef\u4ee5\u6c42\u5230\u500b\u672a\u77e5\u89d2\u3002\u5982\u679c\u4f60\u7528\u5c11\u4e00\u500b\u63d0\u793a\uff0c\u6975\u6709\u53ef\u80fd\u6839\u672c\u4fc2\u5187\u53ef\u80fd\u8a08\u5230\u689d\u6578\uff0c\u6216\u8005\u4f60\u8981\u8d70\u591a\u597d\u591a\u5bc3\u6789\u8def\u3002<\/p><p>\u9664\u5497D\u89d2\u5ea6\uff08\u4f8b\u5982\u2220ABC = 70<sup>o<\/sup>\uff09\u4e4b\u5916\uff0c\u6211\u54cb\u4ea6\u8981\u6ce8\u610f\u5716\u5f62\u4e2d\u7279\u5225\u4e4b\u8655\uff08\u4f8b\u5982\u5e73\u884c\u908a\u3001\u7b49\u8170\u4e09\u89d2\u5f62\u3001\u5713\u7684\u76f4\u5f91\u3001\u5713\u7684\u5207\u7dda\u7b49\uff09\u3002\u53ea\u8981\u6435\u5230\u4f9dD\u7279\u5225\u4e4b\u8655\uff0c\u7528\u4e00\u7528\u76f8\u95dc\u5605\u5b9a\u7406\uff0c\u7b54\u6848\u597d\u53ef\u80fd\u5df2\u7d93\u557e\u547c\u4e4b\u6b32\u51fa\u3002<\/p><p>\u00a0<\/p><h3>12.2.2 \u6280\u5de7\u4e8c : \u5514\u597d\u4ee5\u70ba\u4e00\u5b9a\u53ef\u4ee5\u76f4\u63a5\u8a08\u5230\u500b\u672a\u77e5\u89d2<\/h3><p>\u7c21\u55ae\u5605\u984c\u76ee\u6211\u54cb\u7576\u7136\u4fc2\u7528\u4e00\u500b\u5b9a\u7406\u5c31\u6c42\u5230\u500b\u672a\u77e5\u89d2\u3002\u4f46\u4f9d\u500b\u5514\u4fc2\u5fc5\u7136\u5605\u3002\u597d\u591a\u6642\u6211\u54cb\u53ef\u80fd\u8981\u7528\u5497\u5169\u3001\u4e09\u500b\u5b9a\u7406\u4e4b\u5f8c\u5148\u6c42\u5230\u500b\u672a\u77e5\u89d2\u3002<\/p><p>\u00a0<\/p><h3>12.2.3 \u8ad7\u5413\u8a08\u5230\u908a\u96bb\u89d2\u5148\u53ef\u4ee5\u6c42\u5230\u500b\u672a\u77e5\u89d2<\/h3><p>\u9047\u5230\u6bd4\u8f03\u6df1\u5605\u984c\u76ee\uff0c\u5e45\u5716\u53ef\u80fd\u6709\u5e7e\u500b\u7279\u5225\u4e4b\u8655\u3002\u540c\u5b78\u6703\u554f\u5481\u7528\u908a\u500b\u5148\u5462\uff1f\u55ba\u4f9d\u500b\u6642\u5019\uff0c\u4f60\u53ef\u4ee5\u5148\u554f\u81ea\u5df1<\/p><ul><li>\u5230\u5e95\u8a08\u5230\u908a\u96bb\u89d2\u5c31\u53ef\u4ee5\u8a08\u5230\u500b\u672a\u77e5\u89d2\u5462? \u7576\u55f0\u96bb\u89d2\u4fc2A&#8230;. <\/li><li>\u5481\u518d\u554f\u81ea\u5df1\u60f3\u8a08\u5230A\uff0c\u5481\u53ef\u4ee5\u7528\u908a\u500b\u5b9a\u7406\/\u7279\u5225\u4e4b\u8655\u5462?<\/li><\/ul><p><img decoding=\"async\" class=\"alignright wp-image-2402\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/10\/vdseGeometry_02.webp\" alt=\"\u8207\u5e73\u884c\u7dda\u6709\u95dc\u7684\u4f8b\u5b50\" width=\"200\" height=\"137\" \/>\u7528\u8fd4\u524d\u4e00\u9801\u5605\u4f8b\u5b50\uff1a\u6c42\u53f3\u5716\u4e2d\u7684\u672a\u77e5\u6578\u3002\u5148\u7576\u6211\u54cb\u5514\u77e5\u9ede\u5148\u53ef\u4ee5\u6c42\u5230a\u3002<\/p><p>\u6211\u54cb\u53ef\u4ee5\u8ad7\u5413\u6211\u54cb\u8981\u77e5\u9053\u908a\u96bb\u89d2\u5148\u53ef\u4ee5\u8a08\u5230\u500ba\u3002\u6700\u5bb9\u6613\u7747\u5c31\u4fc2a\u9694\u96e2\u96bb\u89d2\uff08\u56e0\u70ba\u53ea\u8981\u6c42\u5230\u4f62\uff0c\u6211\u54cb\u53ef\u4ee5\u7528\u76f4\u7dda\u4e0a\u7684\u9130\u89d2\u569f\u8a08a\uff09\u3002\u6211\u54cb\u53eb\u4f62\u505ax\u3002\u5481\u5e45\u5716\u5c31\u6703\u8b8a\u6210\u4e0b\u9762\u5e45\u5716\u5481\uff1a<\/p><p style=\"padding-left: 80px;\"><a href=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/10\/dseGeometry_03.webp\"><img decoding=\"async\" class=\"wp-image-2411 alignnone\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/10\/dseGeometry_03.webp\" alt=\"\u8207\u5e73\u884c\u7dda\u6709\u95dc\u7684\u4f8b\u5b50_2\" width=\"200\" height=\"136\" \/><\/a><\/p><p>\u5230\u4f9d\u5ea6\uff0c\u6211\u54cb\u5c31\u8981\u8ad7\u5413\u9ede\u8a08x\u3002\u91cd\u8986\u7528\u4ee5\u4e0a\u5e7e\u500b\u6280\u5de7\uff0c\u6211\u54cb\u6703\u767c\u89bax\u540c\u96bb70<sup>o<\/sup>\u89d2\u4fc2\u540c\u4f4d\u89d2\u3002\u6240\u4ee5x = 70<sup>o<\/sup>\uff0c\u5373\u4fc2\u6211\u54cb\u53ef\u4ee5\u8a08\u5230a\u3002<\/p><p>\u5230\u4f9d\u4e00\u523b\uff0c\u6211\u5730\u5c31\u53ef\u4ee5\u55ba\u7b54\u6848\u7c3f\u5ea6\u5beb\u500b\u7b54\u6848\u3002\u7576\u7136\uff0c\u6211\u5730\u5148\u5beb\u9ede\u8a08\u5230\u500bx\uff0c\u7136\u5f8c\u624d\u5beb\u9ede\u8a08a\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-5e0aa47 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5e0aa47\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-b1c9f5b\" data-id=\"b1c9f5b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-acd3b1b elementor-widget elementor-widget-text-editor\" data-id=\"acd3b1b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/geometry-straight-and-parallel-lines\/\"><i class=\"far fa-arrow-alt-circle-left\" aria-hidden=\"true\"><\/i> \u8207\u76f4\u7dda\u53ca\u5e73\u884c\u7dda\u6709\u95dc\u7684\u5b9a\u7406<\/a>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-cab9686\" data-id=\"cab9686\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-17353ec\" data-id=\"17353ec\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8cf3c39 elementor-widget elementor-widget-text-editor\" data-id=\"8cf3c39\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: right;\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/geometry-triangles\/\">\u8207\u4e09\u89d2\u5f62\u6709\u95dc\u7684\u5b9a\u7406 <i class=\"far fa-arrow-alt-circle-right\" aria-hidden=\"true\"><\/i><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-fe46c8f\" data-id=\"fe46c8f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d80357d elementor-widget elementor-widget-sidebar\" data-id=\"d80357d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"sidebar.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"sidebar-box widget-oceanwp-custom-menu custom-menu-widget clr\"><style type=\"text\/css\">.ocean_custom_menu-5 > ul > li > a, .custom-menu-widget .ocean_custom_menu-5 .dropdown-menu .sub-menu li a.menu-link{font-size:16px;line-height:17px;}.custom-menu-widget .ocean_custom_menu-5.oceanwp-custom-menu > ul.click-menu .open-this{font-size:16px;}<\/style><h4 class=\"widget-title\">DSE\u6578\u5b78 &#8211; \u5fc5\u4fee\u90e8\u5206\u3010\u76ee\u9304\u3011<\/h4><div class=\"oceanwp-custom-menu clr ocean_custom_menu-5 left dropdown-hover\"><ul id=\"menu-dsemaths_core\" class=\"dropdown-menu sf-menu\"><li  id=\"menu-item-1744\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1744\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/course-analysis\/\" class=\"menu-link\">\u8ab2\u7a0b\u5206\u6790 (Core)<\/a><\/li>\n<li  id=\"menu-item-1745\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children dropdown menu-item-1745\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/\" class=\"menu-link\">\u5514\u597d\u4ee5\u70ba\u5514\u99db\u8003 &#8211; \u76ee\u9304 <span class=\"nav-arrow fa fa-angle-down\"><\/span><\/a>\n<ul class=\"sub-menu\">\n\t<li  id=\"menu-item-4067\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4067\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/solving-equation\/\" class=\"menu-link\">1. \u89e3\u65b9\u7a0b<\/a><\/li>\n\t<li  id=\"menu-item-4068\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4068\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/polynomials\/\" class=\"menu-link\">2. \u591a\u9805\u5f0f<\/a><\/li>\n\t<li  id=\"menu-item-4069\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4069\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/laws-of-indices\/\" class=\"menu-link\">3. \u6307\u6578\u5b9a\u5f8b<\/a><\/li>\n\t<li  id=\"menu-item-4070\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4070\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/factorization\/\" class=\"menu-link\">4. \u56e0\u5f0f\u5206\u89e3<\/a><\/li>\n\t<li  id=\"menu-item-4071\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4071\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/formulae\/\" class=\"menu-link\">5. \u516c\u5f0f<\/a><\/li>\n\t<li  id=\"menu-item-4072\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4072\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/percentage\/\" class=\"menu-link\">6. \u767e\u5206\u6cd5<\/a><\/li>\n\t<li  id=\"menu-item-4073\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4073\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/rate-and-ratio\/\" class=\"menu-link\">7. \u7387\u53ca\u6bd4<\/a><\/li>\n\t<li  id=\"menu-item-4074\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4074\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/functions\/\" class=\"menu-link\">8. \u51fd\u6578<\/a><\/li>\n\t<li  id=\"menu-item-4075\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4075\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/estimation\/\" class=\"menu-link\">9. \u4f30\u7b97<\/a><\/li>\n\t<li  id=\"menu-item-4076\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4076\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/inequalities\/\" class=\"menu-link\">10. \u4e0d\u7b49\u5f0f<\/a><\/li>\n\t<li  id=\"menu-item-4077\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4077\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/coordinates\/\" class=\"menu-link\">11. \u5750\u6a19<\/a><\/li>\n\t<li  id=\"menu-item-4079\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4079\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/geometry\/\" class=\"menu-link\">12. \u6f14\u7e79\u63a8\u7406\u5e7e\u4f55<\/a><\/li>\n\t<li  id=\"menu-item-4080\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4080\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/trigonometry\/\" class=\"menu-link\">13. \u4e09\u89d2\u6bd4<\/a><\/li>\n\t<li  id=\"menu-item-4081\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4081\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/shapes\/\" class=\"menu-link\">14. \u5e73\u9762\u53ca\u7acb\u9ad4\u5716\u5f62<\/a><\/li>\n\t<li  id=\"menu-item-4082\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4082\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/15-probability\/\" class=\"menu-link\">15. \u6982\u7387<\/a><\/li>\n\t<li  id=\"menu-item-4083\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4083\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/16-statistics\/\" class=\"menu-link\">16. \u7d71\u8a08<\/a><\/li>\n<\/ul>\n<\/li>\n<li  id=\"menu-item-3231\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3231\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/fundamental_algebra\/\" class=\"menu-link\">\u57fa\u790e &#8211; \u6578\u8207\u4ee3\u6578<\/a><\/li>\n<li  id=\"menu-item-3241\" class=\"menu-item menu-item-type-post_type menu-item-object-page 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