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Mathematics, 18.10.2021 07:10 elainestorm9633

Cho tam giác ABC vuông tại A, đường cao AH. kẻ HE vông góc tại E, HF vông góc tại AC tại F. a) chứng minh: AFHE là hình chữ nhật
b) Lấy M đối xứng với H qua F , N đối xứng H qua E
chứng minh AEFM và AFEN là hình bình hành
c)chứng minh A, M,N thẳng hàng

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Cho tam giác ABC vuông tại A, đường cao AH. kẻ HE vông góc tại E, HF vông góc tại AC tại F. a) chứ...
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