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surface area of cylinder = area of 2 bases + area of rounded surface = 2*(pi * 7^2) + 2pi*7(2) = 98pi + 28pi = 126pi
It is possible for some cones A and cylinders B. But in general, the assertion is false.
1. Find the surface area of the whole cylinder 2. Find the area of one of the two circles on either end of the cylinder 3. Multiply the circle's area by two and subtract their area from the total surface area 4. Now you have the surface area of an unclosed cylinder!
The surface area of a cylinder prism has round shape and the surface of a rectangular prism has a square shape.
The surface area of a cylinder with a radius of 6ft and a height of 7ft is 490.09ft2