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bdkgaming656
2 năm trước
Cho ABC vuông tại A, đường cao AH. Gọi I và K lần lượt là hình chiếu của H trên AB, AC. a) Tứ giác AIHK là hình gì? b) C/m: c) C/m: AIK ∽ ACB, từ đó tính SAIK biết BC = 10cm, AH = 4cm. d) Gọi M là trung điểm của BC. C/m: AM  IK
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