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contuli890
2 năm trước
Cho tam giác ABC có ab bằng 6cm ac bằng 8cm bc bằng 10cm a, Vẽ đường cao AH ( H thuộc BC ). Trên cạnh AC lấy điểm D sao cho AD=AH, từ D vẽ DE vuông AC ( E thuộc BC ). Chứng minh rằng tam giác AHE = tam giác ADE và góc HAE = góc DAE c, Gọi K là giao điểm của AE và HD . Chứng minh AK vuông HD
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