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vinaga2021
2 năm trước
2. Cho tam giác ABC có: góc B =2C . Kẻ BD là tia phân giác của gócABC ( D thuộc AC ), trên tia đối của tia BD lấy điểm N sao cho BN=AC , trên tia đối của tia CB lấy điểm P sao cho CP=AB . a) Chứng minh rằng: tam giác ABN=tam giác PCA. b) Tìm điều kiện của góc ACB để AN vuông góc AP
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