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4 . 8 =32

A cylinder is round and its circular area is dependant on one dimension only - its diameter or radius.

If the diameter is 4 inches then the area is Pi/4 x 42 = 4*Pi

If the diameter is 8 inches then the area is Pi/4 x 82 = 16*Pi

If you needed the surface area and the diameter was 4 inches and the height was 8 inches, then the surface area would be (circumference) x height = (Pi x 4) x 8 = 32*Pi square inches.

Of course Pi = 3.14159 to the nearest 5th decimal.

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Q: How many square inches in a 4 by 8 cylinder?
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