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Assuming the radius is an inside dimension: The inner surface area of the cylinder is Pi x R² = 3.1416 x (3 x 3) = 3.1416 x 9 = 28.2744 sq cm. The area is multiplied by the depth of the sand to find its volume. 28.2744 sq cm x 1 cm = 28.2744 cu cm.

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