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trankhanh4112
2 năm trước
Bài 4: Cho tam giác ABC vuông tại A, vẽ AH vuông góc với BC tại H. Chứng minh rằng: BC2 = 2HA2 + HB2 + HC2 Bài 5: Cho tam giác vuông ABC có cạnh huyền AB = √88 cm, cạnh BC = 6cm. Gọi K là trung điểm của AC. Tính độ dài BK. Bài 6: Tính diện tích tam giác ABC biết ba đường cao của tam giác đó có độ dài là 60cm, 65cm, 156cm.
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