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 trung bình

{"common":{"save":0,"post_id":"6090","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"2331","post_id":"6090","mon_id":"1158530","chapter_id":"1158594","question":"Cho hình tròn tâm O, \u0111\u01b0\u1eddng kính AB = 20 cm. N\u1ed1i các c\u1ed9t phù h\u1ee3p v\u1edbi nhau:<\/p><svg height=\"189.99999999999997\" width=\"251\"> <g><title><\/title><rect fill=\"#fff\" height=\"192\" id=\"canvas_background\" width=\"253\" 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=\"124.4\" cy=\"100.15\" fill=\"#fff\" id=\"svg_1\" rx=\"94.5\" ry=\"87.5\" stroke=\"#000\" stroke-width=\"1.5\"><\/ellipse> <ellipse cx=\"280.9\" cy=\"180.65\" fill=\"#fff\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\"><\/ellipse> <ellipse cx=\"638.9\" cy=\"27.65\" fill=\"#fff\" id=\"svg_3\" rx=\"2\" stroke=\"#000\" stroke-width=\"1.5\"><\/ellipse> <ellipse cx=\"182.9\" cy=\"333.65\" fill=\"#fff\" id=\"svg_4\" rx=\"2\" ry=\"3\" stroke=\"#000\" stroke-width=\"1.5\"><\/ellipse> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"7.9\" xml:space=\"preserve\" y=\"111.65\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"224.14956\" xml:space=\"preserve\" y=\"107.90001\">B<\/text> <line fill=\"none\" id=\"svg_7\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"28.06285\" x2=\"218.06246\" y1=\"98.53136\" y2=\"99.15636\"><\/line> <ellipse cx=\"123.68766\" cy=\"99.15636\" fill=\"#fff\" id=\"svg_8\" rx=\"1.25\" ry=\"1.25\" stroke=\"#000\" stroke-width=\"4\"><\/ellipse> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_9\" stroke=\"#000\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"115.39978\" xml:space=\"preserve\" y=\"123.52498\">O<\/text> <\/g> <\/svg><\/span><\/p>","options":[["\u0110\u1ed9 dài bán kính OA","\u0110\u1ed9 dài \u0111\u01b0\u1eddng kính AB","Trung \u0111i\u1ec3m c\u1ee7a \u0111\u01b0\u1eddng kính AB"],["là \u0111i\u1ec3m O.","10 cm.","20 cm."],["10 cm.","20 cm.","là \u0111i\u1ec3m O."]],"correct":[2,0,1],"level":"2","hint":"","answer":"\u0110áp án \u0111úng là:<\/p>\u0110\u1ed9 dài bán kính OA: 10 cm<\/span><\/strong><\/p>\u0110\u1ed9 dài \u0111\u01b0\u1eddng kính AB : 20 cm<\/span><\/strong><\/p>Trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n th\u1eb3ng AB: là<\/span> \u0111i\u1ec3m O.<\/span><\/strong><\/p>","type":"matching","extra_type":"mat_txt","time":"0","user_id":"129","test":"1","date":"2022-08-11 15:57:54"},{"id":"2332","post_id":"6090","mon_id":"1158530","chapter_id":"1158594","question":"Cho hình tròn sau. Xác \u0111\u1ecbnh tâm, các \u0111\u01b0\u1eddng kính, bán kính c\u1ee7a hình tròn:<\/p><svg height=\"240\" width=\"268\"> <g><title><\/title><rect fill=\"#fff\" height=\"242\" id=\"canvas_background\" width=\"270\" 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=\"133.20723\" cy=\"126.12451\" fill=\"#fff\" id=\"svg_1\" rx=\"96.5\" ry=\"95.07692\" stroke=\"#000\" stroke-width=\"2.5\"><\/ellipse> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_4\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"2.5\" x1=\"36.27885\" x2=\"228.66867\" y1=\"128.04609\" y2=\"128.04609\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_6\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"2.5\" transform=\"rotate(53.48444366455078 131.0763244628906,126.95463562011722) \" x1=\"36.02432\" x2=\"226.12832\" y1=\"126.95463\" y2=\"126.95463\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_7\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"2.5\" x1=\"229.45783\" x2=\"106.56626\" y1=\"127.5\" y2=\"216.65662\"><\/line> <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\" text-anchor=\"start\" x=\"131.86747\" xml:space=\"preserve\" y=\"119.66867\">O<\/text> <ellipse cx=\"132.03358\" cy=\"128.39798\" fill=\"#fff\" fill-opacity=\"null\" id=\"svg_9\" rx=\"2.10841\" ry=\"1.7087\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"2.5\"><\/ellipse> <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=\"16.9142\" xml:space=\"preserve\" y=\"135.08923\">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=\"234.20392\" xml:space=\"preserve\" y=\"136.02381\">C<\/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\" text-anchor=\"start\" transform=\"rotate(-27.696256637573242 69.34411621093749,40.88363265991212) \" x=\"61.30672\" xml:space=\"preserve\" y=\"49.10793\">A<\/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=\"188.40953\" xml:space=\"preserve\" y=\"223.40699\">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\" text-anchor=\"start\" x=\"90.74598\" xml:space=\"preserve\" y=\"236.9584\">E<\/text> <\/g> <\/svg><\/span><\/p>","options":[["Tâm c\u1ee7a hình tròn","Bán kính c\u1ee7a hình tròn","\u0110\u01b0\u1eddng kính c\u1ee7a hình tròn"],["AD, BC","O","OA, OB, OC, OD"],["O","OA, OB, OC, OD","AD, BC"]],"correct":[2,0,1],"level":"2","hint":"","answer":"\u0110áp án \u0111úng là:<\/p>Tâm c\u1ee7a hình tròn: O<\/span><\/strong><\/p>Bán kính c\u1ee7a hình tròn: <\/span>OA, OB, OC, OD<\/span><\/span><\/strong><\/p>\u0110\u01b0\u1eddng kính c\u1ee7a hình tròn: AD, BC<\/span><\/strong><\/p>","type":"matching","extra_type":"mat_txt","time":"0","user_id":"129","test":"1","date":"2022-08-11 16:01:42"},{"id":"2333","post_id":"6090","mon_id":"1158530","chapter_id":"1158594","question":"B\u1ea1n Toàn nói: "Hình tròn tâm O có vô s\u1ed1 bán kính"<\/span>. B\u1ea1n Toàn nói \u0110úng hay Sai? <\/p>","options":["\u0110úng","Sai"],"correct":"1","level":"2","hint":"","answer":"B\u1ea1n Toàn nói: "Hình tròn tâm O có vô s\u1ed1 bán kính" là<\/span> \u0110úng<\/strong><\/span><\/p>","type":"choose","extra_type":"cloud","time":"0","user_id":"129","test":"1","date":"2022-08-11 16:03:47","option_type":"txt","len":0}]}