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As a cylinder is a three dimensional object with volume = {pi}r2h (with r the radius of the circular end and h to height of the cylinder), I presume you mean its surface area:
There are 2 circular ends with area {pi}r2 each.
Plus the curved surface which has one dimension the height of the cylinder, the other the circumference of the circular end, so its area is 2{pi}r x h.
So the total surface area of a cylinder
= 2 x {pi}r2 + 2{pi}r x h
= 2{pi}r(r + h).
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