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thaokimkim1502
2 năm trước
Câu 12. (4 điểm) Cho tam giác ABC có AB = AC = 5cm, BC = 6cm, AM là đường trung tuyến xuất phát từ đỉnh A của tam giác ABC. a) Chứng minh tam giác AMB = tam giác AMC và AM là tia phân giác của góc BAC. b) Chứng minh AM vuông góc với BC c) Tính độ dài các đoạn thẳng BM và AM. d) Từ M vẽ ME vuông góc với AB (E thuộc AB) và MF vuông góc với AC (F thuộc AC). Tam giác MEF là tam giác gì? Vì sao? giúp mình đi
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