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voquocbao000
2 năm trước
Từ một điểm M ngoài đường tròn (O;R) với OM > 2R . Vẽ hai tiếp tuyến MA,MB với đướng tròn (O)[A,B là 2 tiếp điểm ). Gọi I là trung điểm AM, BI cắt (O) tại C, tia MC cắt (O) tại D a) CM: OM vuông góc AB tại H b) CM: IA mũ 2 = IB.IC c) CM: TG AHCI nội tiếp
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