height * circumference (picture the cylinder cut along the long edge, then rolled out flat, and you would measure height * width)
note: if you need to include the circles at the top and bottom of the cylinder, add (circumference / 3.1415926 )^2 * 2 * 3.1415926
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the circumfrance of the base x the height of the cylinder
2*pi*r*h
Take the circumference and multiply it by it's height to get the lateral surface area.
If a is the side,lateral surface area of cube=4a2
Surface Area = 2*pi*r*h (where * means multiply)