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haik54a2
2 năm trước
Cho đường tròn(O) đường kính AB, lấy M thuộc đường tròn(O)sao cho . Kẻ đường kính MN của đường tròn (O). Tiếp tuyến tại A và tiếp tuyến tại M của đường tròn (O) cắt nhau tại C. Tiếp tuyến tại B và tiếp tuyến tại M của (O) cắt nhau tại D. 1) Chứng minh: 4 điểm O, A, C, M cùng thuộc 1 đường tròn; 2) Chứng minh: Tứ giác AMBN là hình chữ nhật và AC. BD= R^2
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