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ngochoa2018
2 năm trước
Cho hình bình hành ABCD, 2 đường chéo AB,CD cắt nhau tại O. Kẻ BH vuông góc AC tại H, BH cắt AC tại N. Kẻ DK vuông góc với AC tại K, DK cắt AB tại M. a) chứng minh: tứ giác BMDN là hình bình hành b) chứng mình tứ giác BKDH là hình bình hành c) chứng minh AC,BD,MN là đồng quy
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