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Math Help - Circular Plot

  1. #1
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    Circular Plot

    The circumference of a circular plot of land is increased by 10%. What is the best estimate of the total percentage that the area of the plot increased?

    (1) 10% (3) 25%
    (2) 21% (4) 31%
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  2. #2
    Super Member malaygoel's Avatar
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    Quote Originally Posted by symmetry View Post
    The circumference of a circular plot of land is increased by 10%. What is the best estimate of the total percentage that the area of the plot increased?

    (1) 10% (3) 25%
    (2) 21% (4) 31%
    final r=1.1
    final r^2=1.21
    hence change=.21=21%
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  3. #3
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    Tell me...

    Where did r=1.1 and r^2=1.21 come from?
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