The circumference of an ellipse is approximated by C=2 π square root of frac a2+b22 where 2a and 2b are the lengths of the axes of the ellipse. Which equation is the result of solving the formula of the circumference for b? b=frac C square root of 2 π -a b= square root of frac C2 π 2-a2 b=frac C square root of π -a b= square root of frac C22 π 2-a2
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