{"article_info":{"article_id":139596,"cat_id":1391,"cat_title":"SGK Toán 8 - Chân trời sáng tạo","publish_time":1685090040,"cat_id2":1391,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_8.png","title":"Giải bài 3 trang 67 SGK Toán 8 – Chân trời sáng tạo","label":"Giải bài 3 trang 67","alias":"giai-bai-3-trang-67-sgk-toan-8-chan-troi-sang-tao","introtext":"Tứ giác ","content":"<style>\r\n.method-close-icon{position: relative;float: right;top: 6px;transform: rotate(270deg);-ms-transform:rotate(270deg);-moz-transform:rotate(270deg);-webkit-transform:rotate(270deg);-o-transform:rotate(270deg);}\r\n.method-open-icon{position: relative;float: right;top: 6px;}\r\n</style>\r\n<p><strong style=\"font-size: 16px;\">Đề bài</strong></p><p>Tứ giác <span class=\"MTConvertedEquation\">\\(ABCD\\)</span> có <span class=\"MTConvertedEquation\">\\(\\widehat A = 100^\\circ \\)</span>, góc ngoài tại đỉnh <span class=\"MTConvertedEquation\">\\(B\\)</span> bằng <span class=\"MTConvertedEquation\">\\(110^\\circ \\)</span>, <span class=\"MTConvertedEquation\">\\(\\widehat C = 75^\\circ \\)</span>. Tính số đo góc <span class=\"MTConvertedEquation\">\\(D\\)</span></p><div id=\"pos_end_question\"></div><div style=\"padding-top: 10px;padding-bottom: 2px;margin-bottom: 10px;\"><p class=\"show-detail-method\" style=\"background: #654bc2;text-align: center;border-radius:5px;padding: 10px;margin-bottom: 0px;\" onclick=\"showDetailMethod();\"><strong style=\"font-size: 16px;\">Phương pháp giải - Xem chi tiết</strong><img class=\"method-open-icon\" id=\"method_colapse_icon\" src=\"data:image/png;base64,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\"></p>  <div class=\"content_method_content\" style=\"padding: 10px 10px 5px 10px;border: dashed 1px #654bc2;border-top:none;\"><p>Tính số đo góc <span class=\"MTConvertedEquation\">\\(B\\)</span></p>\r\n<p>Sử dụng tính chất tổng các góc trong tứ giác bằng \\(360^\\circ \\) để tính số đo góc <span class=\"MTConvertedEquation\">\\(D\\)</span></p>  </div>\r\n<script type=\"text/javascript\">\r\n    var is_open =true;\r\n    function showDetailMethod(){\r\n        if(is_open){\r\n            document.querySelector(\".content_method_content\").style.display='none';\r\n            document.getElementById(\"method_colapse_icon\").classList.remove(\"method-open-icon\");\r\n            document.getElementById(\"method_colapse_icon\").classList.add(\"method-close-icon\");\r\n        }else{\r\n            document.querySelector(\".content_method_content\").style.display='block';\r\n            document.getElementById(\"method_colapse_icon\").classList.remove(\"method-close-icon\");\r\n            document.getElementById(\"method_colapse_icon\").classList.add(\"method-open-icon\");\r\n        }\r\n        is_open = !is_open;\r\n    }\r\n</script>\r\n</div><p><strong style=\"font-size: 16px;\">Lời giải chi tiết</strong></p><p>Ta có: <span class=\"MTConvertedEquation\">\\(\\widehat B = 180^\\circ  - 110^\\circ  = 70^\\circ \\) (vì tổng góc trong và góc ngoài tại một đỉnh bằng \\(180^0\\))</span></p>\r\n<p>Trong tứ giác <span class=\"MTConvertedEquation\">\\(ABCD\\)</span> có tổng bốn góc bằng <span class=\"MTConvertedEquation\">\\(360^\\circ \\)</span> nên:</p>\r\n<p><span class=\"MTConvertedEquation\">\\(\\widehat D = 360^\\circ  - \\left( {100^\\circ  + 70^\\circ  + 75^\\circ } \\right) = 115^\\circ \\)</span></p>","common_article":"","display_type":1,"vungoi_exam_id":"","article_type":1,"cmt_count":0,"zip_status":1,"last_modified_time":1697071119,"last_zip_time":1697071119,"zip_link":"https://offline.loigiaihay.com/articles/1391/139596/139596_1697071119.zip","picture":"https://img.loigiaihay.com/picture/article/2023/0526/1-0_8.png","youtube_id":"ynYjQAPuE7A","video_start_time":"2106","quizlet_id":"0","ref_article_id":0,"readmore_display_type":0,"wiki":0,"comment_url":"https://loigiaihay.com/comment/giai-bai-3-trang-67-sgk-toan-8-chan-troi-sang-tao-c1391a139596.html","origin_url":"https://loigiaihay.com/giai-bai-3-trang-67-sgk-toan-8-chan-troi-sang-tao-c1391a139596.html","relate_link":[],"exam_file":"","solution_file":""},"callouts":[],"relate_articles":[],"others_in_cat":[{"article_id":139599,"cat_id":1391,"publish_time":1685090280,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_9.png","title":"Giải bài 4 trang 67 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-bai-4-trang-67-sgk-toan-8-chan-troi-sang-tao","introtext":"Tứ giác ","display_type":1,"article_type":1},{"article_id":139601,"cat_id":1391,"publish_time":1685090520,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_11.png","title":"Giải bài 5 trang 67 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-bai-5-trang-67-sgk-toan-8-chan-troi-sang-tao","introtext":"Tứ giác","display_type":1,"article_type":1},{"article_id":139605,"cat_id":1391,"publish_time":1685090760,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_13.png","title":"Giải bài 6 trang 67 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-bai-6-trang-67-sgk-toan-8-chan-troi-sang-tao","introtext":"Ta gọi tứ giác ABCD với","display_type":1,"article_type":1},{"article_id":139608,"cat_id":1391,"publish_time":1685091240,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_15.png","title":"Giải bài 7 trang 67 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-bai-7-trang-67-sgk-toan-8-chan-troi-sang-tao","introtext":"Trên bản đồ, tứ giác ","display_type":1,"article_type":1},{"article_id":139595,"cat_id":1391,"publish_time":1685089620,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_6.png","title":"Giải bài 2 trang 66 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-bai-2-trang-66-sgk-toan-8-chan-troi-sang-tao","introtext":"Góc kề bù với một góc của tứ giác ","display_type":1,"article_type":1},{"article_id":139593,"cat_id":1391,"publish_time":1685089200,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_5.png","title":"Giải bài 1 trang 66 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-bai-1-trang-66-sgk-toan-8-chan-troi-sang-tao","introtext":"Tìm số đo các góc chưa biết của các tứ giác trong Hình 11.","display_type":1,"article_type":1},{"article_id":139589,"cat_id":1391,"publish_time":1685087880,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_3.png","title":"Giải mục 2 trang 65, 66 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-muc-2-trang-65-66-sgk-toan-8-chan-troi-sang-tao","introtext":"Đường chéo","display_type":2,"article_type":1},{"article_id":139585,"cat_id":1391,"publish_time":1685086800,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0526/resize_1-0_2.png","title":"Giải mục 1 trang 63, 64, 65 SGK Toán 8 – Chân trời sáng tạo","alias":"giai-muc-1-trang-63-64-65-sgk-toan-8-chan-troi-sang-tao","introtext":"Trong các hình tạo bởi bốn đoạn thẳng","display_type":2,"article_type":1},{"article_id":139978,"cat_id":1391,"publish_time":1685583480,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2023/0601/resize_1-0_3.png","title":"Lý thuyết Tứ giác SGK Toán 8 - 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