{"id":1055,"date":"2020-07-05T06:00:35","date_gmt":"2020-07-04T22:00:35","guid":{"rendered":"https:\/\/www.study-together.com\/edu\/?page_id=1055"},"modified":"2020-11-02T23:16:16","modified_gmt":"2020-11-02T15:16:16","slug":"introduction-to-geometry","status":"publish","type":"page","link":"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/introduction-to-geometry\/","title":{"rendered":"7. \u5e7e\u4f55\u7c21\u4ecb (Introduction to Geometry)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1055\" class=\"elementor elementor-1055\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1f41a8e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1f41a8e\" 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-25432b4\" data-id=\"25432b4\" 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-27cc751 elementor-widget elementor-widget-text-editor\" data-id=\"27cc751\" 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>\u5e7e\u4f55\u5b78(Geometry) \u7684\u62c9\u4e01\u6587\u662f geometein\u3002<\/p><ul><li>geo \u662f\u571f\u5730\u7684\u610f\u601d<\/li><li>metrein \u662f\u6e2c\u91cf\u7684\u610f\u601d<\/li><\/ul><p>\u6240\u4ee5\u5e7e\u4f55\u5b78\u7684\u539f\u610f\u4fc2\u571f\u5730\u6e2c\u91cf\u3002\u800c\u4fc2\u6578\u5b78\u5165\u9762\uff0c\u5e7e\u4f55\u5b78\u4e3b\u8981\u4fc2\u7814\u7a76\u7269\u9ad4\u5f62\u72c0\u3001\u5927\u5c0f\u3001\u4f4d\u7f6e\u4ee5\u53ca\u5b83\u5011\u4e4b\u9593\u76f8\u4e92\u95dc\u4fc2\u5605\u7684\u5b78\u79d1\uff0c\u5305\u62ec\u9ede\u3001\u76f4\u7dda\u3001\u5713\u3001\u66f2\u7dda\u3001\u5e73\u9762\u8207\u7acb\u9ad4\u7b49\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-18c3c41 elementor-widget elementor-widget-text-editor\" data-id=\"18c3c41\" 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 style=\"text-align: left;\">7.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u91cd\u8981\u8a5e\u5f59<\/h2><p>\u65e2\u7136\u5e7e\u4f55\u5b78\u4fc2\u5b78\u7269\u9ad4\u5f62\u72c0\uff0c\u6240\u4ee5\u6211\u5730\u5148\u7747\u4e00\u7747\u4e00D\u6210\u65e5\u6703\u63d0\u5230\u5605\u8a5e\u5f59\u3002\u6211\u76f8\u4fe1\u5927\u5bb6\u5c0d\u7576\u4e2d\u5927\u90e8\u4efd\u5605\u8a5e\u5f59\u90fd\u597d\u719f\u8b58\uff0c\u6240\u4ee5\u55ba\u4f9d\u5ea6\u53ea\u6703\u4f5c\u7c21\u77ed\u88dc\u5145\u3002<\/p><ul><li>\u9ede (point)<ul><li>\u9802\u9ede (vertex)<br \/>\u9802\u9ede\u4fc2\u5169\u689d\u7dda\u5605\u76f8\u9047\u9ede(\u6216\u7a31\u70ba\u76f8\u4ea4\u9ede)\u3002\u4f8b\u5982\u4e00\u500b\u4e09\u89d2\u5f62\u5c31\u67093\u500b\u9802\u9ede\u3002<\/li><\/ul><\/li><li>\u7dda (line)<ul><li>\u5e73\u884c\u7dda (parallel lines)<br \/>\u7576\u5169\u689d\u76f4\u7dda\u5e73\u884c\u6642\uff0c\u7121\u8ad6\u6211\u5730\u9ede\u5c07\u7dda\u5ef6\u9577\uff0c\u4f62\u5730\u6c38\u9060\u90fd\u5514\u6703\u76f8\u4ea4\u5605\u3002<\/li><li>\u5782\u76f4\u7dda (perpendicular line)<br \/>\u76f8\u5169\u689d\u76f4\u7dda\u4fc2\u4e92\u76f8\u5782\u76f4\u5605\u6642\u5019\uff0c\u4f62\u5730\u76f8\u4ea4\u5605\u5730\u65b9\u593e\u4f4f\u55f0\u96bb\u89d2\u4fc290\u5ea6\u3002<p><img decoding=\"async\" class=\"size-full wp-image-1057 aligncenter\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_perpendicularLine.jpg\" alt=\"\u5782\u76f4\u7dda\" width=\"216\" height=\"220\" \/><\/p><\/li><li style=\"text-align: left;\">\u5c0d\u89d2\u7dda (diagonal line)<br \/>\u5c0d\u89d2\u7dda\u4fc2\u6307\u4e00\u500b\u591a\u908a\u5f62\u6216\u8005\u591a\u9762\u9ad4\u5165\u9762\u5605\u5169\u500b\u5c0d\u89d2\u9023\u6210\u5605\u4e00\u689d\u7dda\u3002<figure id=\"attachment_1058\" aria-describedby=\"caption-attachment-1058\" style=\"width: 301px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-1058 size-full\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_diagonalLine.jpg\" alt=\"\u5c0d\u89d2\u7dda\" width=\"301\" height=\"261\" \/><figcaption id=\"caption-attachment-1058\" class=\"wp-caption-text\">\u5716\u4e2dAC\u53caAC&#8217;\u90fd\u4fc2\u5c0d\u89d2\u7dda<\/figcaption><\/figure><\/li><\/ul><\/li><li>\u89d2 (angle)<br \/>\u89d2\u4fc2\u5169\u689d\u7dda\u7dda\u76f8\u4ea4\u5605\u9802\u7aef\uff0c\u800c\u55f0\u5169\u689d\u7dda\u5c31\u53eb\u89d2\u5605\u908a\u3002\u6578\u5b78\u4e0a\uff0c\u89d2\u7528\u2220\u8868\u793a\u3002\u800c\u89d2\u5605\u5927\u7d30\u53eb\u505a\u89d2\u5ea6\u3002<br \/>\u800c\u6309\u89d2\u5ea6\u5605\u5927\u7dda\uff0c\u89d2\u53c8\u53ef\u4ee5\u7d30\u5206\u70ba\u4e0b\u9762\u5e7e\u7a2e\uff1a<ul><li>\u92b3\u89d2 (acute angle)<br \/>\u89d2\u5ea6\u5927\u4e8e0\u00b0\u4e14\u5c0f\u4e8e90\u00b0<\/li><li>\u76f4\u89d2 (right angle)<br \/>\u89d2\u5ea6\u7b49\u65bc90\u00b0<\/li><li>\u920d\u89d2 (obtuse angle)<br \/>\u89d2\u5ea6\u5927\u4e8e90\u00b0\u4e14\u5c0f\u4e8e180\u00b0<\/li><li>\u5e73\u89d2 (line angle)<br \/>\u89d2\u5ea6\u7b49\u65bc180\u00b0<\/li><li>\u53cd\u89d2 (reflex angle)<br \/>\u89d2\u5ea6\u5927\u65bc180\u00b0\u4e14\u5c0f\u65bc360\u00b0<\/li><li>\u88dc\u89d2 (supplementary angles)<br \/>\u76f8\u5169\u96bb\u89d2\u52a0\u57cb\u4fc2180\u00b0\u5605\u6642\u5019\uff0c\u6211\u5730\u6703\u7a31\u4f62\u5730\u70ba\u300c\u4e92\u88dc\u300d\u3002<br \/><img decoding=\"async\" class=\"aligncenter wp-image-1059 size-full\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1Maths_measuring_angles.png\" alt=\"\u89d2\u7684\u5206\ud865\udc8f\" width=\"571\" height=\"417\" srcset=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1Maths_measuring_angles.png 571w, https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1Maths_measuring_angles-300x219.png 300w\" sizes=\"(max-width: 571px) 100vw, 571px\" \/><\/li><\/ul><\/li><li>\u5e73\u9762 (plane)<br \/><span class=\"tlid-translation translation\" lang=\"zh-TW\">\u7c21\u55ae\u569f\u8b1b\uff0c\u4e00\u500b\u5e73\u9762\u53ef\u4ee5\u7747\u6210\u70ba\u4e00\u500b\u5e73\u5766\u800c\u64c1\u6709\u7121\u7aae\u5927\u9762\u7a4d\u7684\u7d19\u3002<\/span><ul><li>\u591a\u908a\u5f62 (polygon)<br \/>\u591a\u908a\u5f62\u4fc2\u6307\u7531\u4e09\u689d\u6216\u4ee5\u4e0a\u5605\u76f4\u7dab\u570d\u6210\u5605\u5e73\u9762\u5716\u5f62\uff0c\u4e5f\u53ef\u4ee5\u53eb\u300c\u591a\u89d2\u5f62\u300d\u3002<br \/>\u4fc2\u521d\u968e\u5e7e\u4f55\u5b78\u5165\u9762\uff0c\u5176\u5be6\u6211\u5730\u6700\u4e3b\u8981\u5b78\u5605\u5c31\u4fc2\u4e09\u89d2\u5f62\u3002<\/li><li>\u6a6b\u5207\u9762 (cross-section)<br \/><span class=\"tlid-translation translation\" lang=\"zh-TW\">\u6a6b\u5207\u9762\u4fc2\u6307\u8207\u7acb\u9ad4\u5605\u9577\u8ef8\u5782\u76f4\u5605\u5207\u9762\u3002\u8209\u500b\u4f8b\u5b50\uff0c\u4e00\u689d\u9999\u8178\u5605\u6a6b\u5207\u9762\u5c31\u4fc2\u4e00\u500b\u5713\u5f62\u3002<\/span><\/li><\/ul><\/li><li>\u4e09\u89d2\u5f62 (triangle) <br \/>\u4e09\u89d2\u5f62\u53ef\u4ee5\u6309\u300c3\u96bb\u89d2\u5605\u5927\u7d30\u95dc\u4fc2\u300d\u6216\u8005\u6309\u300c3\u689d\u908a\u5605\u9577\u5ea6\u95dc\u4fc2\u300d\u569f\u5206\u985e\u3002<ul><li>\u6309\u908a\u9577\u5206\u985e<ul><li>\u7b49\u8170\u4e09\u89d2\u5f62 (isosceles triangle)<br \/>\u7b49\u8170\u4e09\u89d2\u5f62\u4fc2\u4e09\u689d\u908a\u4e2d\u6709\u5169\u908a\u4fc2\u76f8\u7b49\u5605\u4e09\u89d2\u5f62\u3002<ul><li>\u5169\u689d\u76f8\u7b49\u5605\u908a\u53eb\u8170\u3001\u53e6\u4e00\u689d\u908a\u53eb\u5e95\u908a<\/li><li>\u5169\u689d\u8170\u7d44\u6210\u5605\u89d2\u53eb\u9802\u89d2\u3001\u53e6\u5916\u5169\u96bb\u89d2\u53eb\u5e95\u89d2\u3002\u7559\u610f\u5169\u96bb\u5e95\u89d2\u5605\u89d2\u5ea6\u4fc2\u76f8\u7b49\u5605\u3002<br \/><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-1060 aligncenter\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_isosTriangle-300x269.jpg\" alt=\"\u7b49\u8170\u4e09\u89d2\u5f62\" width=\"300\" height=\"269\" srcset=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_isosTriangle-300x269.jpg 300w, https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_isosTriangle.jpg 411w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/li><\/ul><\/li><li>\u7b49\u908a\u4e09\u89d2\u5f62 (equilateral triangle)<br \/><span class=\"st\">\u7b49\u908a\u4e09\u89d2\u5f62\u4fc2\u4e09\u908a\u76f8\u7b49\u5605\u4e09\u89d2\u5f62\u3002\u800c3\u96bb\u5167\u89d2\u76f8\u7b49\uff0c\u90fd\u4fc260\u00b0<br \/><\/span><\/li><li>\u4e0d\u7b49\u908a\u4e09\u89d2\u5f62 (scalene triangle)<br \/>\u5373\u4fc2\u4e09\u89d2\u5f62\u5165\u97623\u689d\u908a\u5605\u9577\u5ea6\u90fd\u5514\u540c\u3002<br \/><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1064 size-full\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_typesOfTraingles2.jpg\" alt=\"\u4ee5\u89d2\u5ea6\u5206\u4e09\u89d2\u5f62\" width=\"665\" height=\"177\" srcset=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_typesOfTraingles2.jpg 665w, https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_typesOfTraingles2-300x80.jpg 300w\" sizes=\"(max-width: 665px) 100vw, 665px\" \/><\/li><\/ul><\/li><li>\u6309\u89d2\u5ea6\u5206\u985e<ul><li>\u92b3\u89d2\u4e09\u89d2\u5f62 (acute-angled triangle)<br \/><span class=\"tlid-translation translation\" lang=\"zh-TW\">\u92b3\u89d2\u4e09\u89d2\u5f62\u7684\u6240\u6709\u5167\u89d2\u5747\u70ba\u92b3\u89d2\uff08\u5373\u5c0f\u65bc90\u00b0\uff09<\/span>\u3002<\/li><li>\u76f4\u89d2\u4e09\u89d2\u5f62 (right-angled triangle)<br \/>\u5982\u679c\u4e00\u500b\u4e09\u89d2\u5f62\u5165\u9762\u6709\u4e00\u96bb\u89d2\u4fc2\u76f4\u89d2(\u537390<span class=\"st\">\u00b0<\/span>)\uff0c\u5481\u4f62\u5c31\u4fc2\u76f4\u89d2\u4e09\u89d2\u5f62\u3002\u593e\u4f4f\u76f4\u89d2\u55f0\u5169\u689d\u908a\u53eb\u76f4\u89d2\u908a\uff0c\u5269\u4f4e\u55f0\u689d(\u5373\u76f4\u89d2\u5c0d\u4f4f\u55f0\u689d)\u53eb\u659c\u908a\u3002<br \/>\u7559\u610f\u55f0\u5169\u689d\u76f4\u89d2\u908a\u4fc2\u53ef\u4ee5\u4e00\u6a23\u9577\u5605\u3002\u5982\u679c\u4fc2\u5481\uff0c\u500b\u4e09\u89d2\u5f62\u5c31\u540c\u6642\u4fc2\u7b49\u8170\u4e09\u89d2\u5f62\u540c\u76f4\u89d2\u4e09\u89d2\u5f62\uff0c\u6240\u4ee5\u53eb\u300c\u7b49\u8170\u76f4\u89d2\u4e09\u89d2\u5f62\u300d\u3002<\/li><li>\u920d\u89d2\u4e09\u89d2\u5f62 (obtuse-angled triangle)<br \/>\u7576\u4e09\u89d2\u5f62\u5165\u9762\u6709\u4e00\u96bb\u89d2\u4fc2\u920d\u89d2\uff08\u5373\u5927\u65bc90\u00b0\uff09\u6642\uff0c\u500b\u4e09\u89d2\u5f62\u5c31\u920d\u89d2\u4e09\u89d2\u5f62\u3002\u7559\u610f\u4e00\u500b\u4e09\u89d2\u5f62\u5165\u9762\u6700\u591a\u53ea\u6709\u4e00\u500b\u920d\u89d2\uff0c\u5373\u4fc2\u5176\u9918\u5169\u89d2\u5747\u5c0f\u65bc90\u00b0\u3002<br \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1063 size-full aligncenter\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_typesOfTraingles.jpg\" alt=\"\u4ee5\u908a\u36bd\u5206\u4e09\u89d2\u5f62\" width=\"655\" height=\"171\" srcset=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_typesOfTraingles.jpg 655w, https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_typesOfTraingles-300x78.jpg 300w\" sizes=\"(max-width: 655px) 100vw, 655px\" \/><\/li><\/ul><\/li><\/ul><\/li><li>\u7acb\u9ad4 (3D Object)<ul><li>\u5713\u67f1\u9ad4 (cylinder)<br \/>\u5713\u67f1\u4fc2\u4e00\u689d\u7531\u9762\u5230\u5e95\u5605\u6a6b\u5207\u9762\u90fd\u4fc2\u540c\u4e00\u5927\u7d30\u5713\u5f62\u5605\u67f1\u3002<\/li><li>\u89d2\u67f1\u9ad4 (prism)<br \/>\u89d2\u67f1\u9ad4\u53c8\u540d\u68f1\u67f1\uff0c\u4fc2\u4e00\u689d\u7531\u9762\u5230\u5e95\u5605\u6a6b\u5207\u9762\u90fd\u4fc2\u540c\u4e00\u5927\u7d30\u5605\u591a\u908a\u5f62\u5605\u67f1\u3002<\/li><li>\u5713\u9310\u9ad4 (cone)<br \/>\u5713\u9310\u9ad4\u500b\u5e95\u4fc2\u5713\uff0c\u4f46\u4e00\u8def\u5411\u4e0a\u79fb\u500b\u5713\u5f62\u6a6b\u5207\u9762\u5c31\ud85f\uded7\u569f\ud85f\uded7\u7d30\uff0c\u53bb\u5230\u500b\u9802\u8b8a\u6210\u4e00\u9ede\u5605\u7acb\u9ad4\u3002<\/li><li>\u89d2\u9310\u9ad4 (pyramid)<br \/>\u540c\u5713\u9310\u9ad4\u5dee\u5514\u591a\uff0c\u53ea\u4fc2\u500b\u5e95\u4fc2\u591a\u908a\u5f62\u3002<\/li><li>\u591a\u9762\u9ad4 (polyhedron)<br \/>\u591a\u9762\u9ad4\u4fc2\u6307\u4e09\u7dad\u7a7a\u9593\u4e2d\u7531\u5e73\u9762\u548c\u76f4\u908a\u7d44\u6210\u7684\u5e7e\u4f55\u5f62\u9ad4\u3002<br \/><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1065 size-full\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_polyhedron.gif\" alt=\"\u591a\u9762\u9ad4\" width=\"417\" height=\"312\" \/><\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b1ede70 elementor-widget elementor-widget-text-editor\" data-id=\"b1ede70\" 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>7.2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5b9a\u7406 (Theorem)<\/h2><p>\u55ba\u4f9d\u5ea6\u5148\u5b78\u540c\u4e09\u89d2\u5f62\u6709\u95dc\u5605\u5e7e\u4f55\u5b9a\u7406\u3002<\/p><ul><li><p>\u76f4\u7dda\u4e0a\u7684\u9130\u89d2 (adj. \u2220s on st. line)<br \/>\u4f9d\u500b\u5b9a\u7406\u4fc2\u6307\u51fa\u76f4\u7dda\u4e0a\u5404\u9130\u89d2\u7684\u548c\u4fc2180<sup>o<\/sup><\/p><\/li><li><p>\u25b3\u5167\u89d2\u548c (\u2220 sum of \u25b3)<br \/>\u4f9d\u500b\u5b9a\u7406\u4fc2\u6307\u51fa\u4e09\u89d2\u5f62\u56053\u96bb\u5167\u89d2\u5605\u7e3d\u548c\u4fc2\u7b49\u65bc180<sup>o<\/sup>\u3002<\/p><\/li><li>\u7b49\u8170\u25b3\u5e95\u89d2 (base \u2220s, isos \u25b3)<br \/>\u4f9d\u500b\u5b9a\u7406\u4fc2\u6307\u51fa\u7b49\u8170\u4e09\u89d2\u5f62\u5605\u5169\u96bb\u5e95\u89d2\u4fc2\u76f8\u7b49\u5605\u3002<\/li><\/ul><p><br \/>\u4f8b1\uff1a\u6c42b\u3002<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1066 size-full\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_anglesOnStLine-e1593898717527.jpg\" alt=\"Eample for Angle on a straight line\" width=\"367\" height=\"161\" srcset=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_anglesOnStLine-e1593898717527.jpg 367w, https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_anglesOnStLine-e1593898717527-300x132.jpg 300w\" sizes=\"(max-width: 367px) 100vw, 367px\" \/><\/p><p style=\"padding-left: 40px;\">\\(\\begin{align} b + 120^{\\circ} &amp; = 180^{\\circ} \\quad \\quad (\u76f4\u7dda\u4e0a\u7684\u9130\u89d2) \\\\<br \/>b &amp; = 60^{\\circ}<br \/>\\end{align} \\)<br \/>\u7559\u610f\uff1a\u4e00\u822c\u505a\u984c\u76ee\u5605\u6642\u5019\uff0c\u8001\u5e2b\u90fd\u6703\u8981\u6c42\u540c\u5b78\u5beb\u4f4e\u7528\u5605\u4fc2\u908a\u689d\u5b9a\u7406\u3002\u5982\u679c\u4fc2\u5b78\u82f1\u6587\u6578\u5605\uff0c\u53ef\u4ee5\u5beb&#8221; (adj. \u2220s on st. line)&#8221;\u3002<\/p><p>\u4f8b2\uff1a\u6c42\u2220A\u3002<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-1067 aligncenter\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_triangle_eg2-300x209.jpg\" alt=\"\u4e09\u89d2\u5f62\u5167\u89d2\u548c\u4f8b\u984c\" width=\"300\" height=\"209\" srcset=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_triangle_eg2-300x209.jpg 300w, https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_triangle_eg2.jpg 374w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p><p style=\"padding-left: 40px;\">\\(\\begin{align} \\angle A + 40^{\\circ} + 50^{\\circ} &amp; = 180^{\\circ} \\quad \\quad (\u25b3\u5167\u89d2\u548c) \\\\<br \/>\\angle A &amp; = 90^{\\circ}<br \/>\\end{align} \\)<\/p><p>\u00a0<\/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-c4b5817 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c4b5817\" 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-e8e89df\" data-id=\"e8e89df\" 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-90474d0 elementor-widget elementor-widget-text-editor\" data-id=\"90474d0\" 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\/secondary\/form1_maths\/approximate-values-estimation\/\"><i class=\"far fa-arrow-alt-circle-left\" aria-hidden=\"true\"><\/i> \u8fd1\u4f3c\u503c\u8207\u4f30\u7b97<\/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-0874710\" data-id=\"0874710\" 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-baff777\" data-id=\"baff777\" 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-40df676 elementor-widget elementor-widget-text-editor\" data-id=\"40df676\" 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\/secondary\/form1_maths\/symmetry-and-transformation\/\">\u5c0d\u7a31\u53ca\u8b8a\u63db <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-9886068\" data-id=\"9886068\" 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-9de5686 elementor-widget elementor-widget-sidebar\" data-id=\"9de5686\" 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-2 > ul > li > a, .custom-menu-widget .ocean_custom_menu-2 .dropdown-menu .sub-menu li a.menu-link{font-size:16px;line-height:17px;}.custom-menu-widget .ocean_custom_menu-2.oceanwp-custom-menu > ul.click-menu .open-this{font-size:16px;}<\/style><h4 class=\"widget-title\">\u4e2d\u4e00\u6578\u5b78\u3010\u76ee\u9304\u3011<\/h4><div class=\"oceanwp-custom-menu clr ocean_custom_menu-2 left dropdown-hover\"><ul id=\"menu-form1mathstopics\" class=\"dropdown-menu sf-menu\"><li  id=\"menu-item-928\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-928\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/directed-numbers\/\" class=\"menu-link\">1. \u6709\u5411\u6578 (Directed Numbers)<\/a><\/li>\n<li  id=\"menu-item-929\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-929\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/algebraic-expressions-equations\/\" class=\"menu-link\">2. \u4ee3\u6578\u5f0f\u548c\u65b9\u7a0b\u5f0f (Algebraic Expressions &#038; Equations)<\/a><\/li>\n<li  id=\"menu-item-995\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-995\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/laws-of-integral-indices\/\" class=\"menu-link\">3. \u6307\u6578\u53ca\u9032\u5236 (Laws of integral indices)<\/a><\/li>\n<li  id=\"menu-item-1000\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1000\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/polynomials\/\" class=\"menu-link\">4. \u591a\u9805\u5f0f (Polynomials)<\/a><\/li>\n<li  id=\"menu-item-1043\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1043\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/using-percentages\/\" class=\"menu-link\">5. \u767e\u5206\u6cd5 (Using percentages)<\/a><\/li>\n<li  id=\"menu-item-1053\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1053\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/approximate-values-estimation\/\" class=\"menu-link\">6. \u8fd1\u4f3c\u503c\u8207\u4f30\u7b97 (Approximate values &#038; estimation)<\/a><\/li>\n<li  id=\"menu-item-1071\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1071\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/introduction-to-geometry\/\" class=\"menu-link\">7. \u5e7e\u4f55\u7c21\u4ecb (Introduction to Geometry)<\/a><\/li>\n<li  id=\"menu-item-1093\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1093\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/symmetry-and-transformation\/\" class=\"menu-link\">8. \u5c0d\u7a31\u53ca\u8b8a\u63db (Symmetry and Transformation)<\/a><\/li>\n<li  id=\"menu-item-1109\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1109\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/congruence-and-similarity\/\" class=\"menu-link\">9. \u5168\u7b49\u53ca\u76f8\u4f3c (Congruence and Similarity)<\/a><\/li>\n<li  id=\"menu-item-1120\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1120\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/estimation-in-measurements\/\" class=\"menu-link\">10. \u91cf\u5ea6\u65b9\u9762\u7684\u4f30\u8a08 (Estimation in measurements)<\/a><\/li>\n<li  id=\"menu-item-1136\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1136\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/area-and-volume\/\" class=\"menu-link\">11. \u9762\u7a4d\u53ca\u9ad4\u7a4d (Area and Volume)<\/a><\/li>\n<li  id=\"menu-item-1150\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1150\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/introduction-to-coordinates\/\" class=\"menu-link\">12.   \u5750\u6a19\u7c21\u4ecb (Introduction to Coordinates)<\/a><\/li>\n<li  id=\"menu-item-1164\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1164\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form1_maths\/introduction-to-statistics\/\" class=\"menu-link\">13.  \u7d71\u8a08\u7c21\u4ecb (Introduction to Statistics)<\/a><\/li>\n<li  id=\"menu-item-16138\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-16138\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/exam_papers\/\" class=\"menu-link\">*** \u521d\u4e2d\u8a66\u5377 \/ \u8a66\u984c\u5eab ***<\/a><\/li>\n<\/ul><\/div><\/div>\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<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\u5e7e\u4f55\u5b78(Geometry) \u7684\u62c9\u4e01\u6587\u662f geometein\u3002 geo \u662f\u571f\u5730\u7684\u610f\u601d metrein \u662f\u6e2c\u91cf\u7684\u610f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":923,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","footnotes":""},"class_list":["post-1055","page","type-page","status-publish","hentry","entry"],"yoast_head":"<!-- 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