user-avatar
nguyenphuongthcsdp
2 năm trước
Bài 4. Cho nửa đường tròn tâm O đường kính MN, tiếp tuyến Nx. Qua A trên nửa đường tròn (A không trùng với hai điểm M,N) kẻ tiếp tuyến với nửa đường tròn cắt Nx ở B. Tia MA cắt Nx ở C. Chứng minh rằng: b) OB vuông góc AN. c) B là trung điểm của NC. giải b và c giúp ạ :3333
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage Have a walk (1) ________ a beach, listen to the sound of the sea waves, and suddenly you see a lot of rubbish on the beach. Pollution takes away all the (2) ________ of our beaches. I feel really annoyed (3) ________ I see plastic bags lying on the sand, cigarette ends buried in the sand, and soda cans floating in the sea. There are a lot of things that we can do. (4) ________ we see rubbish, we should do our part in the protecting the land (5) ________ picking it up and throwing it in dust bins. (6) ________, we can form some kinds of organization that helps (7) ________ the beaches. If everyone does their part, the beaches will be a wonderful and beautiful place. We need to start now (8) ________ the beaches are damaged beyond repair. 1. A, at B, in C, on D, over 2. A, beauty B, beautiful C, beautifully D, being beautiful 3. A, before B, after C, when D, while 4. A, While B, If C, Unless D, Soon 5. A, by B, with C, of D, in 6. A, Nevertheless B,Therefore C, However D, Moreover 7. A, cleaning up B, clean up C, cleaning off D,clean off 8. A, before B, after C, until D, when

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