What is the equation of a circle with center 1and 5 and radius 2?

Answer 1

A circle with centre (xo, yo) and radius r has formula:

(x - xo)2 + (y - yo)2 = r2

For circle with centre (1, 5) and radius 2 this is:

(x - 1)2 + (y - 5)2 = 22

x2 - 2x + 1 +y2 - 10y + 25 = 4

x2 - 2x + y2 - 10y + 22 = 0