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phamvannhan52
2 năm trước
Cho tam giác ABC vuông tại A có góc B 30độ. Tia phân giác của góc C cắt AB tại M. Qua M kẻ đường thẳng vuông góc với BC, cắt BC tại E, cắt AC tại D. a) Chứng minh: tam giác MEC = tam giác MAC. b) Chứng minh: AD = BE . c) Chứng minh: tam giác AEC đều và tam giác EBA cân. d) Gọi N là trung điểm của BD. Chứng minh: C, M, N thẳng hàng.
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