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Minhluc
2 năm trước
Cho ∆ ABC vuông tại A. Trên tia đối của tia AB lấy điểm D sao cho AB = AD. a) Cho AB = 6cm, AC = 8cm. Tính BC b) Chứng minh ∆ ABC = ∆ ADC. Từ đó suy ra ∆ CBD cân c) kẻ AH vuông góc với DC tại H, AK vuông góc với BC tại K. Chứng minh DH = BK d) Chứng minh AC2 + DH2 = AD2 + HC2
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