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hoangnhi060811
2 năm trước
Cho tam giác ABC vuông tại B. Kẻ BH vuông góc với AC tại H. Trên tia đối của tia BH lấy điểm E sao cho BE = AC. Qua E vẽ đường thẳng song song với AB cắt đường thẳng song song với AB cắt đường thẳng BC tại K. a) So sánh: ^BCH VÀ ^BEK ; ^BAC VÀ ^ KBE b) CMR: Tam giác ABC = Tam giác BKE c) Tính số đo của góc ^AKB
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