Because the bases of the cylinder are circles.
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The formula for volume of a cylinder is pi•r2•h
For a right cylinder, the formula for volume is quite simple. It is pi times the radius of the cylinder squared times the height of the cylinder.
Surface Area = 2(pi r 2) + (2 pi r)* h
The formula for area of a circle is radius squared times pi. The formula for volume of a cylinder is radius squared times pi times height.
Volume of a cylinder = pi*radius2*height