算下列侧面积,体面积,体积.1.r=0.2cm,h=3cm2.d=3dm,h=8cm3.c=18.84cm,h=5cm_数学解答

算下列侧面积,体面积,体积.
1.r=0.2cm,h=3cm
2.d=3dm,h=8cm
3.c=18.84cm,h=5cm

人气：324 ℃　时间：2020-05-20 05:29:37

解答

请问是圆柱吗是的1.S侧=2πrh=2×3.14×0.2×3=3.768cmS体=S侧+2S底=3.768+2πr²=3.768+2×3.14×0.2²=4.0192cm²V=πr²h=3.14×0.2²×3=0.3768cm²