{"common":{"save":0,"post_id":"7030","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"4671","post_id":"7030","mon_id":"1158924","chapter_id":"1159141","question":"<p>\u0110\u1ed5i góc l\u01b0\u1ee3ng giác có s\u1ed1 \u0111o 135° sang ra\u0111ian ta \u0111\u01b0\u1ee3c:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\pi$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{\\pi}{4}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{3\\pi}{4}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{\\pi}{2}$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p>135° = 135 . <span class=\"math-tex\">$\\dfrac{\\pi}{180}$<\/span> = <span class=\"math-tex\">$\\dfrac{3\\pi}{4}$<\/span> rad<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{3\\pi}{4}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-11-12 02:11:07","option_type":"math","len":0},{"id":"4672","post_id":"7030","mon_id":"1158924","chapter_id":"1159141","question":"<p>\u0110\u1ed5i góc l\u01b0\u1ee3ng giác có s\u1ed1 \u0111o <span class=\"math-tex\">$\\dfrac{4\\pi}{9}$<\/span> ra\u0111ian sang \u0111\u1ed9 ta \u0111\u01b0\u1ee3c:<\/p>","options":["<strong>A.<\/strong> 20°","<strong>B.<\/strong> 40°","<strong>C.<\/strong> 60°","<strong>D.<\/strong> 80°"],"correct":"4","level":"1","hint":"","answer":"<p><span class=\"math-tex\">$\\dfrac{4\\pi}{9}$<\/span> = <span class=\"math-tex\">$\\dfrac{4. 180}{9}$<\/span> = 80°<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> 80°<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-11-12 02:14:40","option_type":"txt","len":0},{"id":"4674","post_id":"7030","mon_id":"1158924","chapter_id":"1159141","question":"<p>M\u1ed9t \u0111\u01b0\u1eddng tròn có bán kính 10 cm. Tính \u0111\u1ed9 dài c\u1ee7a cung trên \u0111\u01b0\u1eddng tròn \u0111ó có s\u1ed1 \u0111o <span class=\"math-tex\">$\\dfrac{\\pi}{12}$<\/span> (làm tròn k\u1ebft qu\u1ea3 \u0111\u1ebfn hàng ph\u1ea7n tr\u0103m).<\/p>","options":["<strong>A.<\/strong> 2,62 cm","<strong>B.<\/strong> 5,24 cm","<strong>C.<\/strong> 1,31 cm","<strong>D.<\/strong> 0,83 cm"],"correct":"1","level":"1","hint":"","answer":"<p>\u0110\u1ed9 dài c\u1ee7a cung có s\u1ed1 \u0111o <span class=\"math-tex\">$\\dfrac{\\pi}{12}$<\/span> trên \u0111\u01b0\u1eddng tròn bán kính 10 cm là:<\/p><p>l = R . α = 10 . <span class=\"math-tex\">$\\dfrac{\\pi}{12}$<\/span> = <span class=\"math-tex\">$\\dfrac{5\\pi}{6}$<\/span> ≈ 2,62 cm<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 2,62 cm<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-11-12 02:20:50","option_type":"txt","len":0}]}
