What is the equation of a circle with its center at (−6,−3) and a radius of 12?

Answer 1

Start by looking up the equation of a circle:

(x-h)² + (y-k)² = r²

where (h, k) is the location of the circle's center and r is its radius. The problem tells where the center is and what the radius is. Just plug the values of h, k, and r they give you into the equation.