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spackvi
2 năm trước
Bài 4. Cho tam giác ABC cân tại A có AB = AC = 34cm , BC = 32cm . Kẻ đường trung tuyến AM . a) Chứng minh AM ⊥ BC . b) Tính độ dài AM . c) Tinh chu vi và diện tích tam giác AMB . Bài 5. Cho tam giác ABC vuông tại A , đường trung tuyến AD . Trên tia AD lấy điểm E sao cho D là trung điểm của AE . Chứng minh rằng: a) AC//BE. b) AD= 12BC.
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