圆柱的表 面积公式：s表=2πr²+2πrh。 圆柱的表面积=侧面积+两个底面积（s表=s侧+2s底）； 圆柱的侧面积=底面的周长×高，也就是 s侧=2πrh； 圆柱的底面积= 圆的面积，也就是s.
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