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2 năm trước
Cho ∆ABC cân tại A và M là trung điểm của BC . Kẻ MH , MK lần lượt vuông góc với AB và AC ( H thuộc AB , K thuộc AC ) a) chứng minh ∆MBH = ∆MCK b) cho BC = 8cm , BH = 3cm . Tính độ dài cạnh MK c) chứng minh HK// BC d) Cho HK= 1/2 BC . Khi đó ∆ABC là tam giác gì ? Vì sao? mình cần câu d xin ai đó giúp mình với!!
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