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This depends entirely upon the shape, a 100 sq inch circle has a smaller perimeter than a 100 sq inch square. You would look at the formula for the area of the shape and solve for it's linear dimensions (length of a side, radius, etc) and then use those dimensions to figure out the perimeter.

For instance, a 100 sq in square has to have a base and height of 10 inches (10 * 10 = 100). Since a square has four of these 10 inch sides, the perimeter would have to be 40 inches.

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Q: If the area is 100 square inches how do you figure out the perimeter?
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