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The circumference of the base of a cylinder is 132 cm and its height 25 cm . Find the volume of the cylinder .

Solution:  Let  r cm be the radius of the cylinder . Then , 

                Circumference = 132cm 

Rightarrow                            2pi r=132

Rightarrow                            2	imes frac227	imes r =132

Rightarrow                          r = frac132	imes 72 	imes 22Rightarrow r= 21cm

We have , h = height of the cylinder = 25 cm , 

	herefore           Volume of the cylinder  =    pi r^2h = (frac227	imes 21 	imes 21 	imes 25)cm^3=34650 cm^3

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