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Quynhanh1808
2 năm trước
Tam giác: tg, Bình phương: 2 Bài 1: Cho tg ABC nhọn, kẻ AH vuông góc với BC (H thuộc BC).Cho biết AB = 20cm, AH = 12cm, CH = 5cm. tính độ dài cạch BC, AC. Bài 2: Cho tg ABC cân tại B kẻ BH vuông góc AC (H thuộc AC) a, Chứng minh: HA = HC b, Kẻ HD vuông góc AB (D thuộc AB), HE vuông góc BC (E thuộc BC): Chứng minh HD = HE c, Chứng minh tg BDE cân d, Chứng minh BE2 + DH2 = BC2 - HA2
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