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tranhoang
2 năm trước
Cho tam giác ABC (AB<AC )có ba góc nhọn , nội tiếp đường tròn tâm (O) . Hai tiếp tuyến tại B , C của đường tròn (O) cắt nhau tại M , tia AM cắt đường tròn (O) tại điểm thứ hai là D . Gọi E là trung điểm đoạn thẳng AD , tia CE cắt đường tròn tâm O tại điểm thứ hai là F . C/m góc MOC = góc MEC
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