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phamthao15071981
2 năm trước
Cho🔺 ABC vuông tại A. Vẽ đường cao AH . Trên cạnh BC lấy điểm D sao cho BD = BA . a ) Chứng minh : góc BAD = góc ADB b ) Chứng minh : AS là phân giác của góc HAC c ) Vẽ DK vuông góc AC ( K thuộc AC ) . Chứng minh : AK = AH d ) Chứng minh : AB + AC < BC + 2AH
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