Question

A circle has its center at (2,-4). The radius of the circle extends to the

Answer 1

Check the picture below, so the circle looks more or less like so, with a radius of 9.

$\textit{circumference of a circle}\\\\ C=2\pi r~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=9 \end{cases}\implies C=2\pi (9)\implies C\approx 57$