Tổng các góc trong một tam giác

Home Lớp 7 Toán lớp 7 - Sách kết nối tri thức Bài 12: Tổng các góc trong một tam giácBài tập nâng cao

{"common":{"save":0,"post_id":"5686","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7053","post_id":"5686","mon_id":"1158532","chapter_id":"1158548","question":"Câu nào là \u0111úng?<\/p>","options":["A. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là ba góc nh\u1ecdn.","B. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là hai góc vuông.","C. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là hai góc tù.","D. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là ba góc tù."],"correct":"1","level":"3","hint":"","answer":"A. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là ba góc nh\u1ecdn. (\u0111úng)<\/p>B. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là hai góc vuông. (sai,<\/span> vì nhi\u1ec1u nh\u1ea5t là m\u1ed9t góc vuông)<\/p>C. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là hai góc tù. (sai, <\/span>vì nhi\u1ec1u nh\u1ea5t là m\u1ed9t góc tù)<\/p>D. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là ba góc tù. (sai, <\/span>vìnhi\u1ec1u nh\u1ea5t là m\u1ed9t góc tù)<\/p>\u0110áp án \u0111úng là   A. <\/strong>M\u1ed9t tam giác b\u1ea5t kì có nhi\u1ec1u nh\u1ea5t là ba góc nh\u1ecdn.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-11 04:15:29","option_type":"txt","len":3},{"id":"7056","post_id":"5686","mon_id":"1158532","chapter_id":"1158548","question":"Tính x và y trong hình<\/p><svg height=\"170\" width=\"200\"> <g><title><\/title><rect fill=\"#fff\" height=\"172\" 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_13\"> <g id=\"svg_5\"> <path d=\"m18.87019,135.68372l0,-116l163.1199,116l-163.1199,0z\" fill=\"#fff\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <rect fill=\"#fff\" fill-opacity=\"null\" height=\"13\" id=\"svg_2\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\" width=\"13\" x=\"19\" y=\"122.25\"><\/rect> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_3\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"18\" x2=\"75\" y1=\"136.25\" y2=\"62.25\"><\/line> <rect fill=\"#fff\" fill-opacity=\"null\" height=\"13\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\" transform=\"rotate(-53 77.49999999999999,69.75) \" width=\"13\" x=\"71\" y=\"63.25\"><\/rect> <\/g> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_6\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"3\" xml:space=\"preserve\" y=\"130.25\">D<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"6\" xml:space=\"preserve\" y=\"27.25\">E<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"188\" xml:space=\"preserve\" y=\"138.25\">F<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"21\" xml:space=\"preserve\" y=\"54.25\">50<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"36\" xml:space=\"preserve\" y=\"46.25\">o<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"39\" xml:space=\"preserve\" y=\"131.25\">x<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"150\" xml:space=\"preserve\" y=\"131.25\">y<\/text> <\/g> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_14\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"80\" xml:space=\"preserve\" y=\"54.25\">H<\/text> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> x = 40º ; y = 50º","B.<\/strong> x = 50º ; y = 40º","C.<\/strong> x = 35º ; y = 55º","D. <\/strong>x = 55º ; y = 35º"],"correct":"2","level":"3","hint":"","answer":"Xét tam giác DEF vuông t\u1ea1i D ta có<\/p>$\\widehat{E}+\\widehat{F}=90^0 \\\\\\n50^0 + y = 90^0$<\/span><\/p>y = 90º - 50º<\/p>y = 40º<\/p>Xét tam giác DHF vuông t\u1ea1i H ta có<\/p>$\\widehat{HDF}+\\widehat{F}=90^0 $<\/span><\/p>x + y = 90º<\/p>x + 40º = 90º<\/p>x = 90º - 40º<\/p>x = 50º<\/p>V\u1eady x = 50º ; y = 40º<\/p>\u0110áp án \u0111úng là   B.<\/strong> x = 50º ; y = 40º<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-11 04:27:43","option_type":"txt","len":2},{"id":"7058","post_id":"5686","mon_id":"1158532","chapter_id":"1158548","question":"Tính s\u1ed1 \u0111o góc x và y trong hình sau:<\/p><svg height=\"190\" width=\"360\"> <g><title><\/title><rect fill=\"#fff\" height=\"192\" id=\"canvas_background\" width=\"362\" 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_21\"> <line fill=\"none\" id=\"svg_1\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"9\" x2=\"350\" y1=\"100.25\" y2=\"100\"><\/line> <line fill=\"none\" id=\"svg_2\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"22\" x2=\"91\" y1=\"153.25\" y2=\"12.25\"><\/line> <line fill=\"none\" id=\"svg_3\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"91\" x2=\"294\" y1=\"12.25\" y2=\"171.24999\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"71\" xml:space=\"preserve\" y=\"15.25\">D<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"48\" xml:space=\"preserve\" y=\"114.25\">E<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"56\" xml:space=\"preserve\" y=\"95.25\">x<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_9\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"175\" xml:space=\"preserve\" y=\"95.25\">y<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_10\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"83\" xml:space=\"preserve\" y=\"41.25\">85<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_11\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"97\" xml:space=\"preserve\" y=\"30.25\">o<\/text> <g id=\"svg_13\"> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"16\" xml:space=\"preserve\" y=\"94.25\">130<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"38\" xml:space=\"preserve\" y=\"82.25\">o<\/text> <\/g> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_14\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"293\" x2=\"315\" y1=\"170.25\" y2=\"9.25\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_15\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"305\" xml:space=\"preserve\" y=\"111.25\">M<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_16\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"302\" xml:space=\"preserve\" y=\"169.25\">N<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_17\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"198\" xml:space=\"preserve\" y=\"117.25\">F<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_18\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"273\" xml:space=\"preserve\" y=\"153.25\">60<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_19\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"286\" xml:space=\"preserve\" y=\"142.25\">o<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_20\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"293\" xml:space=\"preserve\" y=\"89.25\">z<\/text> <\/g> <\/g> <\/svg><\/span><\/p>","options":["A. <\/strong>x = 70º ; y = 55º","B. <\/strong>x = <\/strong>80º ; y = 45º","C. <\/strong>x = 60º ; y = 55º","D. <\/strong>x = <\/strong>50º ; y = 45º"],"correct":"4","level":"3","hint":"","answer":"Vì x là s\u1ed1 \u0111o c\u1ee7a góc k\u1ec1 bù v\u1edbi góc E nên<\/p>x + 130º = 180º<\/p>x = 180º - 130º<\/p>x = 50º<\/p>Xét tam giác DEF có:<\/span><\/p> $\\widehat{D}+ \\widehat{E}+ \\widehat{F}=180^0$<\/span><\/p>85º + 50º + y = 180º<\/p>y = 180º - 85º - 50º<\/p>y = 45º<\/p>V\u1eady x = 50º ; y = 45º<\/p>\u0110áp án \u0111úng là   D. <\/strong>x = <\/strong>50º ; y = 45º<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-11 04:47:25","option_type":"txt","len":2}]}