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trinhhuydang
2 năm trước
Cho tg ABC có AB = AC=10 cm, BC = 12 cm. Vẽ AH vuông góc BC tại Ḥ a, cm tg ABC cân b, cm tg AHB = tg AHC, từ đó cm AH là Tia phân giác của góc A c, từ H vẽ HM vuông góc với AB (M ∈ AB) và kẻ HN ⊥ AC ( N ∈ AC) . Cm ΔBHM = ΔCHN d, tính độ dài AH e, từ B kẻ Bx ⊥ AB, từ C kẻ Cy ⊥ AC cắt tại O. ΔOBC là Δ gì? Vì Sao ?
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