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HELP CIRCLES

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The radius of a circle is 2 inches. When the radius is doubled, by how many square inches is the area increased? Express your answer in terms of $\pi$.

Apr 6, 2020

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If the radius is 2 inches long, the area is 4pi square inches. Doubling the radius to 4, the area of that would be 16pi square inches. 16pi-4pi=

12pi square inches.'

Apr 6, 2020