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Mathematics, 23.07.2021 14:00 kkpowell

Cho tam giác BDC cân tại D, góc C= 30°. M, N,I lần lượt là trung điểm của BD, BC, DC a) Chứng minh: MNID là hình bình hành
b) Kẻ BA vuông góc với CD( A € CD) . Chứng minh AMNI là hình thang cân và AD= 1/3 AC

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Cho tam giác BDC cân tại D, góc C= 30°. M, N,I lần lượt là trung điểm của BD, BC, DC a) Chứng minh:...

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