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hanhi2k6
2 năm trước
Bài 3 :Cho tam giác MNP cân tại M. Gọi 1 là trung điểm của NP. Lấy điểm Q đối xứng với M qua I. a) Chứng minh tứ giác MNQP là hình thoi. b) Qua Q kẻ đường thẳng d vuông góc với MQ, d cắt MN tại K. Chứng minh tam giác NQK cân. c) Tam giác MNP cần thêm điều kiện gì để PK=2 MI ?
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