Question

This circle is centered at the origin (0,0) the radius is 4, what is the equation?

Answer 1

x^2 +y^2 = 16

Explanation:

The equation of a circle is given by

(x-h) ^2 + (y-k)^2 = r^2 where (h,k) is the center and r is the radius

(x-0) ^2 + (y-0)^2 = 4^2

x^2 +y^2 = 16