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nguyenvancu03021970
2 năm trước
Cho nửa đường tròn (O) đường kính AB và C là điểm chính giữa của cung AB. Lấy điểm M thuộc cung BC và điểm N thuộc tia AM sao cho AN=BM. Kẻ dây CD // với AM. a, CM: tam giác ACN= tam giác BCM b, CM: tam giác CMN vuông cân c, Tứ giác ACND là hình gì? Vì sao?
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