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If that's a rectangular block, you have to use the formula for a rectangle, and add all six sides to get the surface area; since opposite sides are equal, you can group them like this: 2 x 9 x 5 + 2 x 9 x 10 + 2 x 5 x 10.

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Q: What is area for 9' x 5' x 10'?
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