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2.5 cm. If the area of a pentagon is increased by 12.5 cm and each side of the pentagon is the same length, then each side would increase by 2.5 cm. (12.5 cm/ 5 sides = 2.5 cm/ side.

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Q: When the side length of a regular pentagon is increased its perimeter increases by 12.5 cm how much longer is the new side length?
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