{"common":{"save":0,"post_id":"8789","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"11654","post_id":"8789","mon_id":"1159278","chapter_id":"1159333","question":"<p>Cho n\u1eeda \u0111\u01b0\u1eddng tròn (O; R) \u0111\u01b0\u1eddng kính BC. L\u1ea5y \u0111i\u1ec3m A trên tia \u0111\u1ed1i c\u1ee7a tia CB. K\u1ebb ti\u1ebfp tuy\u1ebfn AF, Bx c\u1ee7a n\u1eeda \u0111\u01b0\u1eddng tròn (O) (v\u1edbi F là ti\u1ebfp \u0111i\u1ec3m). Tia AF c\u1eaft tia Bx c\u1ee7a n\u1eeda \u0111\u01b0\u1eddng tròn t\u1ea1i D. Khi \u0111ó t\u1ee9 giác OBDF là:<\/p>","options":["<strong>A.<\/strong> Hình thang","<strong>B.<\/strong> T\u1ee9 giác n\u1ed9i ti\u1ebfp","<strong>C.<\/strong> Hình thang cân","<strong>D.<\/strong> Hình bình hành"],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> T\u1ee9 giác n\u1ed9i ti\u1ebfp.<\/span><\/p><p><span class=\"svgedit\"><svg height=\"185\" width=\"285\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"187\" id=\"canvas_background\" width=\"287\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><g id=\"svg_8\"> <image height=\"155\" id=\"svg_1\" width=\"258\" x=\"10\" 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\" y=\"14.5\"><\/image> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"18\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2\" xml:space=\"preserve\" y=\"177\">B<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"18\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"4\" xml:space=\"preserve\" y=\"18\">D<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"18\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"140\" xml:space=\"preserve\" y=\"83\">F<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"18\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"96\" xml:space=\"preserve\" y=\"180\">O<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"18\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"181\" xml:space=\"preserve\" y=\"179\">C<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"18\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"268\" xml:space=\"preserve\" y=\"169\">A<\/text> <\/g> <\/g> <\/svg><\/span><\/p><p>Ta có <span class=\"math-tex\">$\\widehat{DBO}=90^0$<\/span> và <span class=\"math-tex\">$\\widehat{DFO}=90^0$<\/span> (tính ch\u1ea5t ti\u1ebfp tuy\u1ebfn).<\/p><p>T\u1ee9 giác OBDF có <span class=\"math-tex\">$\\widehat{DBO}+\\widehat{DGO}=90^0+90^0=180^0$<\/span> nên t\u1ee9 giác OBDF là t\u1ee9 giác n\u1ed9i ti\u1ebfp.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-05-28 12:26:56","option_type":"txt","len":2},{"id":"11655","post_id":"8789","mon_id":"1159278","chapter_id":"1159333","question":"<p>Cho ABCD là t\u1ee9 giác n\u1ed9i ti\u1ebfp. Bi\u1ebft <span class=\"math-tex\">$\\widehat{A}=60^0$<\/span>, <span class=\"math-tex\">$\\widehat{B}=85^0$<\/span>. Ch\u1ecdn kh\u1eb3ng \u0111\u1ecbnh \u0111úng.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\widehat{D}=85^0$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\widehat{C}=120^0$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\widehat{C}=110^0$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\widehat{D}=105^0$<\/span>"],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$\\widehat{C}=120^0$<\/span>.<\/span><\/p><p><span class=\"svgedit\"><svg height=\"229\" width=\"291\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"231\" id=\"canvas_background\" width=\"293\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><image height=\"227\" id=\"svg_1\" width=\"289\" x=\"-0.5\" 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robFlyxbsyogyRkgFLIJYkObNm4ctKXbCU6Cnpyf3yT8oY4T8\/cnY1atXsSU1aNAg1t+0aRO2ZEcZI+ouPT2dBQkGq8LCQuxWVEDeWH\/AgAFNOfUTZYyouxMnTrAsWVhYYEt66YmOHTtC09LSMj8\/H7tyoYwRdTdkyJAaGYORzc3NDTo9e\/bMzc1lTblRxohaW7VqFQsY0NbWHjhw4NChQ52dnfv37\/\/LL7\/gnZqGMkYInyoq\/g8KC4TWmQnAoQAAAABJRU5ErkJggg==\" y=\"1.5\"><\/image> <\/g> <\/svg><\/span><\/p><p>Ta có ABCD là t\u1ee9 giác n\u1ed9i ti\u1ebfp nên<\/p><p>♦ <span class=\"math-tex\">$\\widehat{A}+\\widehat{C}=180^0$<\/span> ⇒ <span class=\"math-tex\">$\\widehat{C}=180^0-\\widehat{A}=180^0-60^0=120^0$<\/span>.<\/p><p>♦ <span class=\"math-tex\">$\\widehat{B}+\\widehat{D}=180^0$<\/span> ⇒ <span class=\"math-tex\">$\\widehat{D}=180^0-\\widehat{B}=180^0-85^0=95^0$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-05-28 12:32:24","option_type":"math","len":0},{"id":"11657","post_id":"8789","mon_id":"1159278","chapter_id":"1159333","question":"<p>Xác \u0111\u1ecbnh bán kính \u0111\u01b0\u1eddng tròn ngo\u1ea1i ti\u1ebfp hình ch\u1eef nh\u1eadt ABCD bi\u1ebft AB = 3;<br \/>BC = 4.<\/p>","options":["<strong>A.<\/strong> R = 2","<strong>B.<\/strong> R = 3,5","<strong>C.<\/strong> R = 3","<strong>D.<\/strong> R = 2,5"],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> R = 2,5.<\/span><\/p><p><span class=\"svgedit\"><svg height=\"160\" width=\"200\"> <g> <title><\/title> <rect fill=\"#fff\" height=\"162\" id=\"canvas_background\" width=\"202\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g> <title><\/title> <g id=\"svg_9\"> <g id=\"svg_4\"> <rect fill=\"#fff\" height=\"120\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"160\" x=\"18\" y=\"14.25\"><\/rect> <line fill=\"none\" id=\"svg_2\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"18\" x2=\"178\" y1=\"14.25\" y2=\"134.25\"><\/line> <line fill=\"none\" id=\"svg_3\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"18\" x2=\"178\" y1=\"134.25\" y2=\"14.25\"><\/line> <\/g> <text fill=\"#000000\" font-family=\"Times New Roman, Times, serif\" font-size=\"16\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2\" xml:space=\"preserve\" y=\"15.25\">A<\/text> <text fill=\"#000000\" font-family=\"Times New Roman, Times, serif\" font-size=\"16\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2\" xml:space=\"preserve\" y=\"142.25\">B<\/text> <text fill=\"#000000\" font-family=\"Times New Roman, Times, serif\" font-size=\"16\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"180\" xml:space=\"preserve\" y=\"144.25\">C<\/text> <text fill=\"#000000\" font-family=\"Times New Roman, Times, serif\" font-size=\"16\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"182\" xml:space=\"preserve\" y=\"17.25\">D<\/text> <\/g> <text fill=\"#000000\" font-family=\"Times New Roman, Times, serif\" font-size=\"16\" id=\"svg_10\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"94\" xml:space=\"preserve\" y=\"97.25\">I<\/text> <text fill=\"#000000\" font-family=\"Times New Roman, Times, serif\" font-size=\"16\" id=\"svg_11\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"3\" xml:space=\"preserve\" y=\"73.25\">3<\/text> <text fill=\"#000000\" font-family=\"Times New Roman, Times, serif\" font-size=\"16\" id=\"svg_12\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"88\" xml:space=\"preserve\" y=\"153.25\">4<\/text> <\/g> <\/svg><\/span><\/p><p>G\u1ecdi I là giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng chéo AC và BD c\u1ee7a hình ch\u1eef nh\u1eadt ACBD.<\/p><p>Suy ra I là trung \u0111i\u1ec3m c\u1ee7a AC và BD mà AC = BD nên IA = IB = IC = ID. <\/p><p>Do \u0111ó I là tâm \u0111\u01b0\u1eddng tròn ngo\u1ea1i ti\u1ebfp hình ch\u1eef nh\u1eadt ABCD.<\/p><p>Tam giác ABC vuông t\u1ea1i B. Theo \u0111\u1ecbnh lí Pythagore, ta có: <span class=\"math-tex\">$AC=\\sqrt{AB^2+BC^2}=\\sqrt{3^2+4^2}=5$<\/span>.<\/p><p>Bán kính R = AC : 2 = 5 : 2 = <span style=\"color:#16a085;\">2,5 <\/span>(cm).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-05-29 07:48:51","option_type":"txt","len":0}]}