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Nguyenlexuanduy
2 năm trước
cho hình chữ nhật ABCD có AB=8cm, AD=6cm. Kẻ AH ⊥ BD (H ∈BD ) A.chứng minh tam giác AHB đồng dạng với tam giác BCD B.Chứng minh tam giác ABD đồng dạng với tam giác HAD từ đó suy ra AD2=DH.DB C.tính độ dài đoạn thẳng DH Xinh giúp em với ạ!Em cảm ơn
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