{"id":1285,"date":"2020-07-11T13:22:14","date_gmt":"2020-07-11T05:22:14","guid":{"rendered":"https:\/\/www.study-together.com\/edu\/?page_id=1285"},"modified":"2020-11-02T23:47:38","modified_gmt":"2020-11-02T15:47:38","slug":"trigonometric-ratios","status":"publish","type":"page","link":"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/trigonometric-ratios\/","title":{"rendered":"10. \u4e09\u89d2\u6bd4 (Trigonometric Ratios)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1285\" class=\"elementor elementor-1285\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-bd910ee elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"bd910ee\" 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-09ec7f9\" data-id=\"09ec7f9\" 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-bf81113 elementor-widget elementor-widget-text-editor\" data-id=\"bf81113\" 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>\u4e09\u89d2\u6bd4\uff08trigonometric ratio\uff09\u662f\u4e09\u89d2\u5b78(Trigonometry)\u7684\u57fa\u672c\u6982\u5ff5\u4e4b\u4e00\u3002\u7c21\u55ae\u569f\u4fc2\u6307\u4e00\u500b\u76f4\u89d2\u4e09\u89d2\u5f62\u5165\u9762\u5169\u689d\u908a\u5605\u6bd4\u3002<\/p><h2>10.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u4e09\u89d2\u6bd4\u7684\u57fa\u790e\u77e5\u8b58<\/h2><ul><li>\u55ba\u521d\u4e2d\u968e\u6bb5\uff0c\u4e09\u89d2\u6bd4\u5605\u53ea\u6703\u9069\u7528\u53ca\u51fa\u73fe\u65bc\u76f4\u89d2\u4e09\u89d2\u5f62\u4e0a\u3002<img fetchpriority=\"high\" decoding=\"async\" class=\"alignright wp-image-1440 size-medium\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_trigo01-300x206.jpg\" alt=\"\u4e09\u89d2\u6bd4\u4e2d\u7684\u908a\u53ca\u89d2\" width=\"300\" height=\"206\" srcset=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_trigo01-300x206.jpg 300w, https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_trigo01.jpg 734w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/li><li>\u5728\u5b9a\u7fa9\u4e09\u89d2\u6bd4\u51fd\u6578\u6642\uff0c\u6211\u5730\u8981\u5148\u77e5\u9053\u54a9\u4fc2\u659c\u908a\u3001\u9130\u908a\u53ca\u5c0d\u908a\u3002<ul><li>\u76f4\u89d2\u7684\u5c0d\u908ac\u4fc2\u659c\u908a (hypotenuse)<\/li><li>\u76f8\u5c0d\u65bc\u03b8\u4f86\u8aaa\uff0c<ul><li><em>b<\/em>\u662f\u5c0d\u908a(opposite side)<\/li><li><em>a<\/em>\u662f\u9130\u908a(adjacent side)<\/li><\/ul><\/li><li>\u76f8\u5c0d\u65bc\u03b2\u4f86\u8aaa<ul><li><em>a<\/em>\u662f\u9130\u908a<\/li><li><em>b<\/em>\u662f\u5c0d\u908a<\/li><\/ul><\/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-b6faedb elementor-widget elementor-widget-text-editor\" data-id=\"b6faedb\" 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>10.2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u4e09\u89d2\u6bd4\u4e4b\u5b9a\u7fa9<\/h2><p>\u55ba\u521d\u4e2d\u968e\u6bb5\uff0c\u540c\u5b78\u8981\u8a8d\u4ee5\u4e0b\u4e09\u500b\u4e09\u89d2\u51fd\u6578<\/p><ul><li style=\"list-style-type: none;\"><ul><li>\u6b63\u5f26 \/ Sine\u00a0 (\u6578\u5f0f\u4e2d\u5beb\u4f5c sin)<\/li><li>\u9918\u5f26 \/ Cosine\u00a0 (\u6578\u5f0f\u4e2d\u5beb\u4f5c cos)<\/li><li>\u5207\u5f26 \/ Tangent (\u6578\u5f0f\u4e2d\u5beb\u4f5c tan)<\/li><\/ul><\/li><\/ul><p>\u4f62\u5730\u5605\u5b9a\u7fa9\u4fc2<\/p><ul><li style=\"list-style-type: none;\"><ul><li>\\(sin \\theta = \\dfrac{\u5c0d\u908a}{\u659c\u908a} \\)<\/li><li>\\(cos \\theta = \\dfrac{\u9130\u908a}{\u659c\u908a} \\)<\/li><li>\\(tan \\theta = \\dfrac{\u5c0d\u908a}{\u9130\u908a} \\)<\/li><\/ul><\/li><\/ul><p>\u5e0c\u671b\u5927\u5bb6\u6709\u7559\u610f\u5230 sin\u3001cos\u540ctan\u5f8c\u9762\u90fd\u6709\u4e00\u96bb\u89d2\u55ba\u5ea6\u3002\u9019\u662f\u4e00\u5b9a\u7684\uff0c\u56e0\u70ba\u5982\u679c\u7121\u5497\u96bb\u89d2\u55ba\u5ea6\u4f5c\u70ba\u53c3\u8003\u9ede\uff0c\u908a\u689d\u4fc2\u9130\u908a\u3001\u908a\u689d\u4fc2\u5c0d\u908a\u5c31\u7121\u6cd5\u53bb\u5224\u65b7\u7684\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-4906aae elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4906aae\" 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-75bdc56\" data-id=\"75bdc56\" 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-aa2a44c elementor-widget elementor-widget-text-editor\" data-id=\"aa2a44c\" 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\/form2_maths\/pythagoras-theorem\/\"><i class=\"far fa-arrow-alt-circle-left\" aria-hidden=\"true\"><\/i> \u7562\u6c0f\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-f833a9c\" data-id=\"f833a9c\" 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-e295e8f\" data-id=\"e295e8f\" 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-0070c0e elementor-widget elementor-widget-text-editor\" data-id=\"0070c0e\" 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\/area-and-volume\/\">\u9762\u7a4d\u548c\u9ad4\u7a4d <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-66bacea\" data-id=\"66bacea\" 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-3ba22a5 elementor-widget elementor-widget-sidebar\" data-id=\"3ba22a5\" 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-3 > ul > li > a, .custom-menu-widget .ocean_custom_menu-3 .dropdown-menu .sub-menu li a.menu-link{font-size:16px;line-height:17px;}.custom-menu-widget .ocean_custom_menu-3.oceanwp-custom-menu > ul.click-menu .open-this{font-size:16px;}<\/style><h4 class=\"widget-title\">\u4e2d\u4e8c\u6578\u5b78\u3010\u76ee\u9304\u3011<\/h4><div class=\"oceanwp-custom-menu clr ocean_custom_menu-3 left dropdown-hover\"><ul id=\"menu-form2mathstopics\" class=\"dropdown-menu sf-menu\"><li  id=\"menu-item-1248\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1248\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/approximation-errors\/\" class=\"menu-link\">1. \u8fd1\u4f3c\u8207\u8aa4\u5dee (Approximation &#038; Errors)<\/a><\/li>\n<li  id=\"menu-item-1261\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1261\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/identities\/\" class=\"menu-link\">2. \u6046\u7b49\u5f0f (Identities)<\/a><\/li>\n<li  id=\"menu-item-1266\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1266\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/factorization\/\" class=\"menu-link\">3. \u56e0\u5f0f\u5206\u89e3 (Factorization)<\/a><\/li>\n<li  id=\"menu-item-1265\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1265\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/formulae\/\" class=\"menu-link\">4. \u516c\u5f0f (Formulae)<\/a><\/li>\n<li  id=\"menu-item-1278\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1278\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/simultaneous-linear-equations\/\" class=\"menu-link\">5. \u806f\u7acb\u4e8c\u5143\u4e00\u6b21\u65b9\u7a0b (Simultaneous Linear Equations)<\/a><\/li>\n<li  id=\"menu-item-1279\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1279\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/rate-and-ratio\/\" class=\"menu-link\">6. \u7387\u53ca\u6bd4 (Rate and Ratio)<\/a><\/li>\n<li  id=\"menu-item-1280\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1280\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/use-of-percentage\/\" class=\"menu-link\">7. \u767e\u4efd\u6cd5 (Use of Percentage)<\/a><\/li>\n<li  id=\"menu-item-1302\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1302\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/geometry\/\" class=\"menu-link\">8. \u5e7e\u4f55\u5b9a\u7406 (Geometry)<\/a><\/li>\n<li  id=\"menu-item-1303\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1303\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/pythagoras-theorem\/\" class=\"menu-link\">9. \u7562\u6c0f\u5b9a\u7406 (Pythagoras\u2019 Theorem)<\/a><\/li>\n<li  id=\"menu-item-1304\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1304\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/trigonometric-ratios\/\" class=\"menu-link\">10. \u4e09\u89d2\u6bd4 (Trigonometric Ratios)<\/a><\/li>\n<li  id=\"menu-item-1305\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1305\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/areas-and-volumes\/\" class=\"menu-link\">11. \u9762\u7a4d\u548c\u9ad4\u7a4d (Areas and Volumes)<\/a><\/li>\n<li  id=\"menu-item-1306\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1306\"><a href=\"https:\/\/www.study-together.com\/edu\/secondary\/form2_maths\/statistics\/\" class=\"menu-link\">12. \u7d71\u8a08 (Statistics)<\/a><\/li>\n<li  id=\"menu-item-16137\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-16137\"><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>\u4e09\u89d2\u6bd4\uff08trigonometric ratio\uff09\u662f\u4e09\u89d2\u5b78(Trigonometry)\u7684\u57fa\u672c\u6982\u5ff5\u4e4b\u4e00\u3002\u7c21\u55ae\u569f\u4fc2\u6307 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1238,"menu_order":9,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"ocean_front_end_style_editor":"no","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-1285","page","type-page","status-publish","hentry","entry"],"yoast_head":"<!-- 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