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tieutinhlinh145
2 năm trước
Cho hình bình hành ABCD có diện tích S. Gọi M, N, I, K theo thứ tự là trung điểm của AB, BC, CD, DA. Gọi E và F theo thứ tự là giao điểm của KB với Al và MC. Gọi H và G theo thứ tự là giao điểm của DN với AI và MC. a) Chứng minh rằng EFGH là hình bình hành. b) Tính diện tích hình bình hành EFGH theo S. Giải chi tiết giúp em với
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