The circle below is centered at (2, 3) and has a radius of 4. What is its equation?

Equation of a Circle: (x-h) ² + (y-k) ²=r² where (h, k) is the center and r is the radius.

So, all we need to do is plug in your info:

(x-2) ² + (y-3) ²=4²

And, there goes your answer.