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gaming7319825
2 năm trước
Cho tam giác ABC vuông tại A, đường cao AH. Biết BC = 8cm, BH = 2cm. a) Tính độ dài các đoạn thẳng AB, AC, AH. b) Vẽ đường phân giác AD. Gọi E và F lần lượt là hình chiếu của D lên AB và AC. Chứng minh AEDF là hình chữ nhật. Tính EF ? c) tính các góc trong tam giác ADH?
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