回答正确给50分

分类: 作业答案 • 2022-05-11 09:05:29

问题描述：

回答正确给50分
有一种魔术帽,冒顶为圆柱状的红色布,帽檐是黑色布,冒顶的底面直径和高与帽檐宽度都是12厘米.哪种布用的多?多多少?

答

12/2=6(厘米)
12+6=18(厘米)
黑布(圆环面积)：3.14*（18*18-6*6）=904.32（平方厘米）
红布(圆锥无底表面积)：12*3.14*12=452.16（平方厘米）
因为904.32>452.16 故黑布用的多,多904.32-452.16=452.16（平方厘米）

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回答正确给50分

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