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A circle is cut out of a piece of plywood that is 10 inches square The scraps are then thrown away How many square inches of plywood are thrown away?

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2008-05-08 02:42:26
2008-05-08 02:42:26

The area of the square was 100 sq in (10 x 10). Assuming the circle was cut out of the square form edge to edge, the area of the 10 inch diameter circle is found as follows: A = Pi x R² where Pi is 3.1416 and R² is the radius multiplied by itself (the radius is one half of the diameter). Using the formula: A = 3.1416 x (5 x 5) = 3.1416 x 25 = 78.54 sq in. Subtract the area of the circle from the area of the square to find how much material was thrown away. (100 - 78.54 = 21.46 sq in)

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