Question

Write the equation of a circle with a center of (1,-2) and radius of 4.

Answer 1

(x - 1)^2 + (y + 2)^2 = 4^2

Explanation:

The standard equation of a circle of radius r with center at (h, k) is

(x - h)^2 + (y - k)^2 = r^2

Replacing h with 1, y with -2 and r with 4, we get:

(x - 1)^2 + (y + 2)^2 = 4^2