Question

If the area of a circle is 64 pi, then whats the circumference?

Answer 1

the circumference of a circle is
`\pi x^(2)`

Answer 2

`The\ area\ of\ the\ circle:A_O=\pi r^2\\\\The\ circumference\ of\ the\ circle:C_O=2\pi r\\===========================\\\\A_O=64\pi\Rightarrow\pi r^2=64\pi\\\\r^2=64\Rightarrow r=√(64)\Rightarrow r=6\\\\C_O=2\pi\cdot8=\boxed{16\pi}`