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The radius of a circle is increased by 85%. How much will the area increase in percent? Round your answer to the nearest tenth if a percent.

I'm stuck on this question. Thanks

  • Algebra -

    original area = pi(1^2) = pi
    new area = pi(1.85^2) = 3.4225pi

    increase = 3.4225pi - pi = 2.4225pi

    percentage increase = 2.4225pi/pi = 2.4225
    = 242.3 %

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