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pttquyen2128
2 năm trước
Cho tâm giác ABC có 3 góc đều nhọn, đường cao AH vuông góc với BC tại H. Trên tia đối của tia HA lấy điểm D sao cho HA=HD a/ Chứng minh BC và CB lần lượt là các tia phân giác của các góc ABD và ACD b/ Chứng minh CA=CD và BD= BA c/ Cho góc ACB =45 độ. Tính góc ADC d/ Đường cao AH phải có thêm điều kiện gì thì AB // CD
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