Hình tròn. Tâm, bán kính, đường kính của hình tròn

Home Toán lớp 3 - Tập 1 CHỦ ĐỀ 3 - LÀM QUEN VỚI HÌNH PHẲNG, HÌNH KHỐI Bài 17: Hình tròn. Tâm, bán kính, đường kính của hình trònBài tập nâng cao

{"common":{"save":0,"post_id":"6091","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"2341","post_id":"6091","mon_id":"1158530","chapter_id":"1158594","question":"Bán kính c\u1ee7a hình tròn sau là:<\/p><svg height=\"250\" width=\"265\"> <g><title><\/title><rect fill=\"#fff\" height=\"252\" id=\"canvas_background\" width=\"267\" 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><ellipse cx=\"128.9\" cy=\"124.17631\" fill=\"#fff\" id=\"svg_1\" rx=\"100\" ry=\"94\" stroke=\"#000\" stroke-width=\"2.5\"><\/ellipse> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_3\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"2\" x1=\"27.80808\" x2=\"227.80736\" y1=\"124.73077\" y2=\"124.73077\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_4\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"70.88485\" x2=\"214.77097\" y1=\"47.03874\" y2=\"172.70631\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_7\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"71.92134\" x2=\"127.18423\" y1=\"48.50036\" y2=\"217.44692\"><\/line> <ellipse cx=\"127.71054\" cy=\"124.55263\" fill=\"none\" fill-opacity=\"null\" id=\"svg_8\" rx=\"1.57894\" ry=\"1.31578\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"2\"><\/ellipse> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"8.76374\" xml:space=\"preserve\" y=\"130.07892\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"232.97322\" xml:space=\"preserve\" y=\"130.07892\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"8.76374\" xml:space=\"preserve\" y=\"130.07892\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"57.18456\" xml:space=\"preserve\" y=\"43.23722\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_13\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"120.86848\" xml:space=\"preserve\" y=\"238.49946\">D<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_14\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"127.18424\" xml:space=\"preserve\" y=\"144.81569\">O<\/text> <text fill=\"#884D58\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_15\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.8027114272117614,0,0,0.7832868695259094,11.647258216448334,4.9443930341972155) \" x=\"85.57882\" xml:space=\"preserve\" y=\"177.30338\">E<\/text> <text fill=\"#884D58\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_16\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.8027114272117614,0,0,0.7832868695259094,11.647258216448334,4.9443930341972155) \" x=\"181.96222\" xml:space=\"preserve\" y=\"146.39463\">F<\/text> <\/g> <\/svg><\/span><\/p>","options":["CD","OB","EC","ED"],"correct":"2","level":"3","hint":"","answer":"Hình v\u1ebd trên là hình tròn tâm O, bán kính OA, OB.<\/p>\u0110áp án \u0111úng là OB<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"129","test":"1","date":"2022-08-11 16:48:21","option_type":"txt","len":0},{"id":"2342","post_id":"6091","mon_id":"1158530","chapter_id":"1158594","question":"Cho hình tròn tâm O có \u0111\u01b0\u1eddng kính AB = 20cm. M\u1ed9t \u0111i\u1ec3m M n\u1eb1m trên hình tròn. \u0110\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng OM b\u1eb1ng bao nhiêu?<\/p><svg height=\"220\" width=\"220\"> <g><title><\/title><rect fill=\"#fff\" height=\"222\" id=\"canvas_background\" width=\"222\" 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><ellipse cx=\"108.98349\" cy=\"110.94174\" fill=\"#fff\" id=\"svg_1\" rx=\"95.5\" ry=\"94.5\" stroke=\"#000\" stroke-width=\"1.5\"><\/ellipse> <ellipse cx=\"108.92226\" cy=\"110.75104\" fill=\"none\" fill-opacity=\"null\" id=\"svg_3\" rx=\"1.51423\" ry=\"1.20617\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\"><\/ellipse> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_2\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"13.9\" x2=\"203.4814\" y1=\"110.65001\" y2=\"110.16164\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6000428199768066,0,0,0.6690009236335754,3.0668141491469214,38.874050055424505) \" x=\"-3.05891\" xml:space=\"preserve\" y=\"111.75569\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" transform=\"matrix(0.6000428199768066,0,0,0.6690009236335754,3.0668141491469214,38.874050055424505) \" x=\"338.33465\" xml:space=\"preserve\" y=\"111.75569\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(1.0649526162330096,0,0,0.7432855075982939,-76.89585884519678,26.019590193509323) \" x=\"167.32695\" xml:space=\"preserve\" y=\"136.29663\">0<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6000428199768066,0,0,0.6690009236335754,3.0668141491469214,38.874050055424505) \" x=\"276.77189\" xml:space=\"preserve\" y=\"-7.60252\">M<\/text> <ellipse cx=\"164.14614\" cy=\"33.88536\" fill=\"none\" fill-opacity=\"null\" id=\"svg_11\" rx=\"1.51423\" ry=\"1.20617\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\"><\/ellipse> <line fill=\"none\" id=\"svg_12\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"109.25373\" x2=\"163.73135\" y1=\"110.44777\" y2=\"34.32836\"><\/line> <\/g> <\/svg><\/span><\/p>","options":["5 cm","10 cm","15 cm","20 cm"],"correct":"2","level":"3","hint":"","answer":"M n\u1eb1m trên hình tròn nên OM là bán kính hình tròn. \u0110\u1ed9 dài bán kính hình tròn b\u1eb1ng m\u1ed9t n\u1eeda \u0111\u01b0\u1eddng kính c\u1ee7a hình tròn \u0111ó. \u0110\u1ed9 dài c\u1ee7a \u0111o\u1ea1n th\u1eb3ng OM là:<\/p>20 : 2 = 10 (cm)<\/p>\u0110áp án \u0111úng là 10 cm<\/strong><\/span><\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"129","test":"1","date":"2022-08-11 16:49:59","option_type":"txt","len":0},{"id":"2343","post_id":"6091","mon_id":"1158530","chapter_id":"1158594","question":"S\u1ed1 bán kính \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n trong hình d\u01b0\u1edbi \u0111ây là:<\/p><svg height=\"258\" width=\"286\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"260\" id=\"canvas_background\" width=\"288\" x=\"-1\" y=\"-1\"><\/rect> <g 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y=\"0\"><\/image> <\/g> <\/svg><\/span><\/p>","options":["1 \u0111o\u1ea1n th\u1eb3ng","2 \u0111o\u1ea1n th\u1eb3ng","3 \u0111o\u1ea1n th\u1eb3ng","4 \u0111o\u1ea1n th\u1eb3ng"],"correct":"4","level":"3","hint":"","answer":"Hình tròn trên là hình tròn tâm O, có các bán kính g\u1ed3m: OA, OB, OC, OD<\/p>S\u1ed1 bán kính \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n trên hình tròn là: 4 \u0111o\u1ea1n th\u1eb3ng<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"129","test":"1","date":"2022-08-11 16:51:24","option_type":"txt","len":1}]}