Question #N77

A circle in the $xy$-plane has center $(1,2)$ and radius 3. Which of the following is an equation of the circle?
A. (x + 1)^2 + (y + 2)^2 = 3
B. (x - 1)^2 + (y - 2)^2 = 3
C. (x - 1)^2 + (y - 2)^2 = 9
D. (x + 1)^2 + (y + 2)^2 = 9