Các bạn ơi giúp mình với Mình cảm ơn ạ Cho hình chóp S.ABCD có đáy là hình vuông cạnh a SD=3a/2. Hình chiếu vuông góc của S lên mp ABCD là trung điểm AB a, kc từ A-(SAD) b, kc từ B-(SAD) c, kc từ B-(SCD) d, góc giữa (SCD) và đáy

Các câu hỏi liên quan

51. my mother/ go shopping/ with/ friends/ in/ park/ three days ago. => ________________________________ 52. Lan/ cook/ chicken noodles/ dinner/ last Friday? => ________________________________ 53. Nam/ I/ study/ hard/ last weekend. => ________________________________ 54. my father/ play/ golf/ yesterday. => ________________________________ 55. last night/ Phong/listen/ music/ for two hours. => ________________________________ 56. they/ have/ nice/ weekend?. => ________________________________ 57. she/ not go/ supermarket yesterday. => ________________________________ 58. We/ not go/ school last week. => ______________________________________________________________ 59. I /lose/ my keys when I /walk/ home.  => ______________________________________________________________ 60. It /be/ raining while we /have/ dinner yesterday. => ______________________________________________________________ 61. I /saw the department stores when /I /sit/ the bus. => ______________________________________________________________ 62. Her phone /ring/ while she /talk/ her new boss/ last night.  => ______________________________________________________________ 63. My friends ________ (drive) to work when they heard the news on the radio.  => ______________________________________________________________ 64. At this time last year, I/ attend/ English course. => ______________________________________________________________ 65. Last night /while I/ study/ my room, my roommates/ have/ party / the other room.