7th grader please help

Mathematics
Tutor: None Selected Time limit: 1 Day

Apr 29th, 2015

If the radius or a circle is r, then the the area is pi*r^2, while the circumference is 2*pi*r (probably you know that).

Here pi*r^2 = 196*pi, so r^2 = 196, r = 14 (inches).
Therefore circumference is 2*pi*r = 28*pi (inches).

Apr 29th, 2015

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Apr 29th, 2015
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Apr 29th, 2015
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