What is the radius of a circle with an area of $420$ $420$ $c m^{2}$ $cm^2$ ?

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Answer 1 · 2016-05-07T10:19:02

R = $(420/π)^(1/2)$

Area of circle is $πR^2$

Hence,

420 = $πR^2$
R = $(420/π)^(1/2)$

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