如果一个圆的直径扩大5倍，那么半径扩大 一个圆柱体的底面半径扩大4倍，高扩大5倍，它的底面直径扩大_...
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设圆的半径为r，则直径=2r，周长=2πr，面积=πr2，π是一个定值，则：（1）圆的直径与半径成正比例、周长与圆的半径成正比例，即圆的半径扩大5倍时，直径就扩大5倍，周长也是扩大5倍；
（2）圆的面积与r2成正比例，即半径r扩大5倍，则r2就扩大5×5=25倍，所以圆的面积就扩大25倍．
故答案为：5倍；5；25倍．
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