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【简答题】
已知圆锥侧面展开图的面积是15πcm 2 ，母线的长是5cm． （1）这个圆锥的底面半径是多少？ （2）在这个圆锥的底面上，有一点P，它到中心O的距离是1cm．请找出过这一点到边缘两端的最长弦和最短弦的长．
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A.
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C.
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