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Konganh12
2 năm trước
Cho tam giác ABC vuông tại A. Gọi M là trung điểm của BC. Trên tia đối của tia MA lấy điểm E sao cho ME=MA. a) Tính số đo của góc ABC khi góc ACB= 40 độ. b) Chứng minh tam giác AMB= tam giác EMC và AB //EC. c) Từ C kẻ đường thẳng (d) song song với AE. Kẻ EK vuông góc đường thẳng (D) tại K. Chứng minh góc KEC= góc BCA.
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