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honhuquynh090
2 năm trước
Vẽ hình và giải giúp mk vs Cho ΔABC vuông tại A (AB>AC). Trên tia đối của tia AC lấy điểm D sao cho AD=AB, trên tia đối của AB lấy điểm E sao cho DE=BC. a. Chứng minh ΔABC=ΔADE b. Chứng minh góc AEC = góc ACE = 45 độ c. Đường cao AH của ABC cắt DE tại F. Qua A kẻ đường vuông góc với CF tại G, đường thẳng này cắt đường thẳng BC tại K. Chứng minh: FK//AB.
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