If the area of a circle is 21ft. what would the circumference be

If the area of a circle is 21ft. what would the circumference be
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serkel...area=21...mite be ft^2 but kant be "feet"

area=pi*radius^2

so radius=root(21/pi)=root(8.684507617)=2.585441474

rim-leng=2*pi*radius

=6.2831853*2.585441474

=16.24480786

#### or...rim-leng=2*area/radius=42/2.585441474
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