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13问答网 > 圆柱的表面积还可以用✀✀s表=2πr*(r+h)✀✀来计算，你知道为什么吗?写清楚

圆柱的表面积还可以用✀✀s表=2πr*(r+h)✀✀来计算，你知道为什么吗?写清楚

急急急急急急急急急急急急急急急急急急急急急急急急急急

2025-03-16 09:56:21

推荐回答（2个）

回答1：

S表=两个底面+侧面积底面积是圆，你应该知道的。侧面积展开是个长方形。长是圆的周长，宽是柱体的高。所以S侧=2πr*h,再整理式子就好了。

回答2：

展开表达式s=2πr*r+2πr*h, 底面积=2πr*r，侧面积=2πr*h。

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