It is: 2*pi*5*20 = 200*pi square cm
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A = (Pi x D) x H A = (3.1416 x 8 cm) x 10 cm A = 251.3274 cm2
Square feet or square meters, or whatever unit you are using
You find the square root an then label it as the side.
depends on the brand. it will be on the label.
radius squared multiplied by pie