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thuydungtd2006
2 năm trước
Cho tam giác ABC nhọn, đường cao AH. Lấy các điểm P, Q lần lượt đối xứng với H qua AB, AC. a) Chứng minh AP = AQ;b) Cho BAC   600 .Tính số đo PAQ  c) Gọi I, K lần lượt là giao điểm của PQ với AB, AC. Chứng minh API AHI AHK AQK   ; .   d) Chứng minh HA là phân giác của IHK
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