Cho hình thang ABCD (AB//CD) đáy CD. Gọi O là giao điểm của AC và BD. Khoảng cách từ O đến AD bằng khoảng cách từ O đến BC. Chứng minh ABCD là hình thang cân.
Hình thang này đáy là gì vậy bạn? –  Trần Nhật Tân 27-03-13 03:10 PM

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 10:04 AM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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