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Notice that if you were to slit the cylinder down the side, unroll it, and lay it flat,

you'd have a rectangle, with one dimension equal to the circumference of the base,

and the other dimension equal to the height of the cylinder.

The surface area is just "rectangle's" (length) x (width) = (2 pi R) x (h) .

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Q: How do you find total surface area of an open cylinder?
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