Từ một điểm A ở bên ngoài đường tròn (O;R). Vẽ hai tiếp tuyến AM và AN ( M,N là hai tiếp điểm). Kẻ cát tuyến ABC. Gọi I là trung điểm của dây BC
a) Chứng minh 5 điểm A,M,I,O,N cùng nằm trên một đường tròn
b)Nếu AM= OM thì tứ giác AMON là hình gì? Vì sao?
c) Cho AM=R. Tính diện tích đường tròn và độ dài đường tròn ngoại tiếp AMON
HELP ME PLEASE!!!
<<Bài tập từ loại>>
1. We couldn't win the prize. We were ....(success)
2. Our team played ......, so we lost (success)
3. This man ......in writing (success)
4. With a good....... of the criminal from witnesses, the police were able to find him easily (describe)
5. There has been a ............ (reduce) of 10% in the amount of the money available for buying the new books
6. Women who are slimming can never enjoy a meal without being afraid of .........(organize) then diet
7. She always listen ..... (attention) to what she is told
8. He was ........ (information) of the consequences in advance
9. His health was seriously affected and suffered from constant ........... (sleep)
10. In ancient Greece, the owl was a symbol of ......... (wise)
11. The judge told him it was ............ (responsible) to drink and drive, and banned him for a year
Thank you