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quanganh010109
2 năm trước
cho nửa đường tròn tâm O đường kính AB 2R. Kẻ các tiếp tuyến Ax, By của nửa đường tròn (O) tại A và B. Qua điểm M thuộc nửa đường tròn (M khác A và B),kẻ tiếp tuyến với nửa đường tròn, cắt Ax, By theo thứ tự tại C và D. a) Chung minh tam giac COD vuong tai O b) Chung minh AC.BD=R^2
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