Question

How do you find the circumference of a circle with area

Answer 1

Given an area \(A\), you can determine the radius \(r\):
\[A=\pi r^2~~\implies~~r=\sqrt{\frac{A}{\pi}}\]
The circumference is then
\[C=2\pi r=2\pi\sqrt{\frac{A}{\pi}}=2\sqrt{\pi A}\]