Surface and volume

Calculate the surface and volume of a cylinder whose height is 8 dm and the radius of the base circle is 2 dm
 

Correct result:

S =  125.6637 dm2
V =  100.531 dm3

Solution:

h=8 dm r=2 dm  S1=π⋅ r2=3.1416⋅ 22≐12.5664 dm2 S2=2π⋅ r⋅ h=2⋅ 3.1416⋅ 2⋅ 8≐100.531 dm2  S=2⋅ S1+S2=2⋅ 12.5664+100.531=125.6637 dm2
V=S1⋅ h=12.5664⋅ 8=100.531 dm3

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