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lebahoan205
2 năm trước
cho tam giác ABC cân tại A , gọi M là trung điểm cạnh AC, vẽ điểm D đối xứng với điểm B qua M a) CM tg ABCD là hình bình hành b) Gọi H LÀ trung điểm BC, K là trung điểm AD. TG AHCK là hình gì? vì sao c) cm: H,M,K thẳng hàng d) Tìm điều kiệncủa tam giác ABC để tg AHCK là hv { các bạn chỉ cần làm phần c, d cho mình thôi nha }
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