{"id":2472,"date":"2020-10-18T22:50:52","date_gmt":"2020-10-18T14:50:52","guid":{"rendered":"https:\/\/www.study-together.com\/edu\/?page_id=2472"},"modified":"2020-11-02T17:24:42","modified_gmt":"2020-11-02T09:24:42","slug":"trigonometry-basic-usage","status":"publish","type":"page","link":"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/trigonometry-basic-usage\/","title":{"rendered":"13. \u4e09\u89d2\u6bd4 > \u4e09\u89d2\u51fd\u6578\u57fa\u672c\u904b\u7528"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2472\" class=\"elementor elementor-2472\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8e394d7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8e394d7\" 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-0cd8859\" data-id=\"0cd8859\" 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-c69a56a elementor-widget elementor-widget-text-editor\" data-id=\"c69a56a\" 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>13.2. \u4e09\u89d2\u51fd\u6578\u57fa\u672c\u904b\u7528<\/h2><p>\u6bcf\u4e00\u500b\u4e09\u89d2\u51fd\u6578\u5605\u5b9a\u7fa9\u90fd\u6709\u5169\u689d\u908a\u4e00\u96bb\uff0c\u6240\u4ee5 \u4e09\u89d2\u51fd\u6578\u57fa\u672c\u904b\u7528 \u5c31\u4fc2\u6bd4\u5176\u4e2d\u5169\u500b\u4f60\uff0c\u7136\u5f8c\u8981\u4fc2\u8a08\u8fd4\u5269\u4f4e\u55f0\u500b(\u53ef\u80fd\u4fc2\u908a\u6216\u89d2)\u3002<\/p><p>\u800c\u7576\u4e2d\u6700\u7dca\u8981\u5605\u4fc2<\/p><ul><li style=\"list-style-type: none;\"><ul><li>\u8a18\u5f97sin, cos, tan \u5605\u5b9a\u7fa9<\/li><li>\u7136\u5f8c\u64c7\u500b\u5571\u7528\u5605\u5b9a\u7fa9\u569f\u8a08\u689d\u6578<\/li><\/ul><\/li><\/ul><p>\u00a0<\/p><p><a href=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/10\/dseJunior_trigo_01.webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-2475 alignright\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/10\/dseJunior_trigo_01.webp\" alt=\"\u4e09\u89d2\u51fd\u6578\u57fa\u672c\u904b\u7528 - \u4f8b1\" width=\"278\" height=\"183\" \/><\/a>\u4f8b1\uff1a\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6c42\u53f3\u5716\u4e2d\u7684\u672a\u77e5\u6578 x \u53ca \u03b8\u3002<br \/>\u89e3\u8aaa\uff1a\u00a0\u00a0\u00a0 \u5927\u5bb6\u9996\u5148\u990a\u6210\u4e00\u500b\u300c\u898b\u5230\u76f4\u89d2\u4e09\u89d2\u5f62\u8981\u8a08\u672a\u77e5\u6578\u80fd\u5148\u7747\u5605\u7528\u5514\u7528\u5230\u4e09\u89d2\u51fd\u6578\u300d\u5605\u7fd2\u6163\u3002<\/p><ul><li>\u56e0\u70ba\u984c\u76ee\u6bd4\u5497\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\u5605\u5169\u689d\u908a\uff0c\u6240\u4ee5\u5229\u7528\u4e09\u500b\u51fd\u6578\uff0c\u5176\u4ed6\u5605\u908a\u540c\u89d2\u90fd\u4e00\u5b9a\u53ef\u4ee5\u8a08\u5230\u3002<\/li><li><span style=\"text-decoration: underline;\">\u8a08\u7b97 \u03b8 \u7684\u601d\u8def<\/span><ul><li>\u6211\u54cb\u61c9\u5148\u5224\u65b7\u5c0d\u03b8 \u569f\u8b1b\uff0c\u689d&#8221;4\u5605\u908a&#8221;\u540c&#8221;8\u5605\u908a&#8221;\u4fc2\u54a9\u908a(\u5373\u9130\u908a\u3001\u659c\u908a\u5b9a\u5c0d\u908a)<ul><li>4\u662f \u03b8 \u7684\u9130\u908a<\/li><li>8 \u4fc2\u76f4\u89d2\u5c0d\u9762\u5605\u908a\uff0c\u6240\u4ee5\u4f62\u4fc2\u659c\u908a<\/li><\/ul><\/li><li>\u5305\u542b\u9130\u908a\u540c\u659c\u908a\u7684\u4e09\u89d2\u51fd\u6578\u662f cos<\/li><li>\u6240\u4ee5\u6211\u54cb\u8981\u5605\u5f0f\u4fc2\uff1a \\( cos \\theta = \\dfrac{\u9130\u908a}{\u659c\u908a} \\}<\/li><li>\u5373 \\( cos \\theta = \\dfrac{4}{8} \\)<br \/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\(\\theta = 60^{\\circ} \\)<\/li><\/ul><\/li><li>\u8a08\u7b97 x \u7684\u601d\u8def (\u4e00)<br \/><ul><li>\u56e0x\u662f\u4e00\u689d\u908a\uff0c\u6240\u4ee5\u5982\u679c\u7528\u4e09\u89d2\u51fd\u6578\uff0c\u6211\u54cb\u8981\u77e5\u9053\u53e6\u4e00\u689d\u908a\u540c\u4e00\u96bb\u89d2<ul><li>\u5df2\u77e5 \u03b8 = 60<sup>o<\/sup>\uff1b<\/li><li>\u53e6\u4e00\u689d\u908a\u53ef\u9078 \u201c4\u201d<\/li><\/ul><\/li><li>\u56e0\u70ba\u6211\u54cb\u7528\u03b8\uff0c\u6240\u4ee5x\u662f\u201c\u5c0d\u908a\u201d\uff0c\u201c4\u201d\u4fc2\u201c\u9130\u908a\u201d<\/li><li>\u5305\u542b\u5c0d\u908a\u53ca\u9130\u908a\u7684\u4e09\u89d2\u51fd\u6578\u4fc2 tan<\/li><li>\u6240\u4ee5\u6211\u54cb\u8981\u5605\u5f0f\u4fc2\uff1a \\( tan \\theta = \\dfrac{\u5c0d\u908a}{\u9130\u908a} \\}<\/li><li>\u5373 \\( tan 60^{\\circ} = \\dfrac{x}{4} \\)<br \/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\( x = 4 \\times tan 60^{\\circ} = 6.93 \\)<\/li><\/ul><\/li><li>\u8a08\u7b97 x \u7684\u601d\u8def (\u4e8c)<ul><li>\u540c\u601d\u8def(\u4e00)\u5dee\u5514\u591a\uff0c\u53ea\u4fc2\u6211\u5730\u4fc2\u5605\u5514\u4fc2&#8221;4\u908a&#8221;\u800c\u4fc2&#8221;8\u908a&#8221;<ul><li>8\u908a\u4fc2&#8221;\u659c\u908a&#8221;<\/li><\/ul><\/li><li>\u5305\u542b\u5c0d\u908a\u53ca\u659c\u908a\u7684\u4e09\u89d2\u51fd\u6578\u4fc2 sin<\/li><li>\u6240\u4ee5\u6211\u54cb\u8981\u5605\u5f0f\u4fc2\uff1a \\( sin \\theta = \\dfrac{\u5c0d\u908a}{\u659c\u908a} \\}<\/li><li>\u5373 \\( sin 60^{\\circ} = \\dfrac{x}{8} \\)<br \/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\( x = 8 \\times sin 60^{\\circ} = 6.93 \\)<\/li><\/ul><\/li><li>\u8a08\u7b97 x \u7684\u601d\u8def (\u4e09)<ul><li>\u9664\u5497\u7528\u4e09\u89d2\u6bd4\u51fd\u6578\uff0c\u6211\u5730\u90fd\u53ef\u4ee5\u7528\u7562\u6c0f\u5b9a\u7406\u3002<\/li><\/ul><\/li><\/ul><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-37128fa elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"37128fa\" 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-ea83447\" data-id=\"ea83447\" 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-30d8195 elementor-widget elementor-widget-text-editor\" data-id=\"30d8195\" 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\/trigonometry-function-definition\/\"><i class=\"far fa-arrow-alt-circle-left\" aria-hidden=\"true\"><\/i> \u4e09\u89d2\u51fd\u6578\u7684\u5b9a\u7fa9<\/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-d07990b\" data-id=\"d07990b\" 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-06703b3\" data-id=\"06703b3\" 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-61e3c7e elementor-widget elementor-widget-text-editor\" data-id=\"61e3c7e\" 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\/trigonometry-daily-application\/\">\u4e09\u89d2\u6bd4\u61c9\u7528 <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-e1fd129\" data-id=\"e1fd129\" 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-8be5de8 elementor-widget elementor-widget-sidebar\" data-id=\"8be5de8\" 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 menu-item-3241\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/fundamental-shape_n_space\/\" class=\"menu-link\">\u57fa\u790e &#8211; \u5ea6\u91cf\u3001\u5716\u5f62\u8207\u7a7a\u9593<\/a><\/li>\n<li  id=\"menu-item-3246\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3246\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/fundamental_data_handling\/\" class=\"menu-link\">\u57fa\u790e &#8211; \u6578\u64da\u8655\u7406<\/a><\/li>\n<li  id=\"menu-item-3290\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3290\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/non_fundamental_algebra\/\" class=\"menu-link\">\u975e\u57fa\u790e &#8211; \u6578\u8207\u4ee3\u6578<\/a><\/li>\n<li  id=\"menu-item-3288\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3288\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/non_fundamental-shape_n_space\/\" class=\"menu-link\">\u975e\u57fa\u790e &#8211; \u5ea6\u91cf\u3001\u5716\u5f62\u8207\u7a7a\u9593<\/a><\/li>\n<li  id=\"menu-item-3289\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3289\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/non_fundamental_data_handling\/\" class=\"menu-link\">\u975e\u57fa\u790e &#8211; \u6578\u64da\u8655\u7406<\/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>13.2. \u4e09\u89d2\u51fd\u6578\u57fa\u672c\u904b\u7528 \u6bcf\u4e00\u500b\u4e09\u89d2\u51fd\u6578\u5605\u5b9a\u7fa9\u90fd\u6709\u5169\u689d\u908a\u4e00\u96bb\uff0c\u6240\u4ee5 \u4e09\u89d2\u51fd\u6578\u57fa\u672c\u904b\u7528 \u5c31\u4fc2\u6bd4\u5176\u4e2d\u5169\u500b\u4f60\uff0c\u7136 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