Question

A circle has its center at (-2, -3) and a radius of 3 units. What is the equation of the circle?
A. (x+2)^2 + (y-3)^2 =9
B. (x-2)^2 + (y-3)^2 =3
C. (x+2)^2 + (y+3)^2 =9
D. (x+2)^2 + (y+3)^2 =3

Answer 1

Equation of circle is (x-h)^2 + (y-k)^2 = r^2
Plug the point and radius in, h=the x value, k=the y value, r=radius
Answer is C. (x+2)^2 + (y+3)^2 = 9