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jokerchannel333
2 năm trước
Làm giúp mình phần b. Cho hình bình hành ABCD (góc BCD nhọn) có AD = 2AB = 2a (a không đổi cho trước). Từ điểm C kẻ CE vuông góc với AB (E thuộc AB), tia phân giác của BCD cắt AD tại M. Từ M kẻ MF vuông góc với CE (F thuộc CE), đường thẳng MF cắt BC tại N. a) Tứ giác MNCD là hình gì? Vì sao? b) Chứng minh MEC là tam giác cân và AN = ME.
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