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honghiepc3dongthanh
2 năm trước
cho tứ giác ABCD có AC⊥BD, AC=24, BD=10. Gọi M,N,P,Q lần lượt là trung điểm của AB, BC, CD, AD. C/m 4 điểm M,N,P,Q cùng nằm trên 1 đường tròn. Tính bán kính của đường tròn ngoại tiếp Vẽ hình luôn nha^^ cảm ơn
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