Question

Determine the standard form of the equation for the circle with center (h,k)= (0,-2) and radius r=9

Answer 1

Use the std eqn of a circle with center at (h,k) and radius r:

(x-0)^2 + (y+2)^2 = 9^2, or just x^2 + (y+2)^2 = 9^2.