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khoitranvan70
2 năm trước
CÁC GIÁO SƯ, TIẾN SĨ, BÁC HỌC ƠI!!! CHÁU CẦN GẤP!!! 1,cho tam giác ABC nhọn nội tiếp đường tròn O. Đg phân giác của góc A cắt đường tròn ở P. đg cao AH cắt cạnh BC ở H. CM: a,OP song song với AH b, AP là tpg của góc OAH 2,cho tam giác ABC nội tiếp đường tròn O có trực tâm H nằm trong tam giác. Tia AO cắt đg tròn ở D. a, tứ giác BHCD là hình gì???Why???? b, gọi I là trung điểm của BC. Cm 3 điểm H,I,D thẳng hàng. c, CM: AH=2OI
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