5.0463 cm is. (rounded)
(Note: "80cm" is not an area. "80cm2" is, and was assumed for the solution above.)
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The surface area of a cylinder where height is 80cm and radius is 15cm equals 8953.54cm2
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
The area of a circle of radius 21 is 1386
A circle with a radius of 135 units has an area of 57,255.53 square units.