Imagine that the cylinder is like a soda can.
To get the surface area you would need to calculate: top and bottom surfaces and the surface of the thing that goes around.
Left part of formula: 2πrh calculates the body of cylinder.
This is when every circumference of body of cylinder 2πr is multiplied by height of cylinder h
Right part of formula: 2πr2 calculated areas of top and bottom circles.
This is simply the area of circle 2πr multiplied by 2
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