user-avatar
dothuat1994
2 năm trước
Cho tam giác ABC nội tiếp đường tròn (O). Gọi M, N thứ tự là trung điểm của AB, AC. Kẻ AH vuông góc BC tại H. 1) Chứng minh AMON là tứ giác nội tiếp 2) Gọi I là trung điểm của AO. Kẻ dây AE của đường tròn tâm I, đường kính AO sao cho AE // BC. Đường thẳng HE cắt MN tại K. Chứng minh IK vuông góc với BC.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

GIÚP TUI ZỚI !! PLEASE 7: Rice, coffee, fruits and vegetables are Viet Nam’s agricultural …………. A. produce B. production C. products D. productive 8: Thanks for the flowers you sent me while I was in hospital. They helped to cheer me ........ A. over B. up C. on D. in 9: We have lived here ………….. years. A. for B. from C. at D. since 10: She ……… me she didn’t know what to do. A. talked B. told C. said D. spoke 11: Would you mind if I ………….. a photo? A. takes B. take C. took D. taken 12: The …………... festival was held in the communal house yard. A. rice - cook B. rice – cooking C. rice – cooker D. rice – cooked 13: He has worked with the computer …………. early morning. A. for B. from C. since D. until 14: It is dangerous …………… in this river. A. swim B. swam C. swimming D. to swim 15: During his life, Thomas Edison made a lot of …………. A. inventions B. discoveries C. findings D. phone calls 16: Please tell me …………… to get to the bus station. A. why B. which C. what D. how 17: Mary …………… in a small house in the countryside A. lives B. live C. living D. lived 18: Would you mind putting out you cigarette? ~ ………………. A. No, thanks. B. No, of course not C. No, I wouldn’t. D. No, I don’t. 19: Sa Pa, located in the north of Viet Nam, is a mountainous …………. A. resort B. beach C. wonder D. hotel 20: The train …………. at the station yet. A. didn’t arrive B. hasn’t arrived C. isn’t arriving D. doesn’t arrive

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team