π取3.14
圆柱的底面半径r=C/2π=6.28/6.28=1dm
圆柱的底面积S底=πr^2=3.14×1=3.14dm^2
圆柱的侧面积S侧=Ch=6.28×2.5=15.7dm^2
圆柱的表面积S柱=S底+S侧=15.7+3.14=18.84dm^2
π取3.14
圆柱的底面半径r=C/2π=6.28/6.28=1dm
圆柱的底面积S底=πr^2=3.14×1=3.14dm^2
圆柱的侧面积S侧=Ch=6.28×2.5=15.7dm^2
圆柱的表面积S柱=S底+S侧=15.7+3.14=18.84dm^2