Cylinder from paper

From a rectangle measuring 20 x 30 cm, we roll a cylinder with a height of 30 cm. Find its volume and surface.

Correct answer:

V =  954.9297 cm3
S =  663.662 cm2

Step-by-step explanation:

a=20 cm b=30 cm  a = o = 2π r r=a/(2π)=20/(2 3.1416)3.1831 cm  S1=π r2=3.1416 3.1831231.831 cm2  V=S1 b=31.831 30=954.9297 cm3
S=2 S1+a b=2 31.831+20 30=663.662 cm2



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