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uyenthuy168
2 năm trước
Cho tam giác ABC vuông tại A có AC = 2AB . Lấy D là trung điểm của AC. Trên tia đối của tia AC lấy điểm H sao cho AH = AD. a, Cm: Tam giác DBH cân b, Biết AD = 5cm. Tính BC c, Trên nửa mặt phẳng bờ AC không chứa điểm B kẻ tia Hx vuông góc với HA tại H. Vẽ cung tròn tâm D bán kính bằng BC, cung tròn này cắt tia Hx ở E. Chứng minh AD = HE. d, Chứng minh tam giác BEC là tam giác vuông cân.
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