Question

Find the center and radius of the circle x2+y2=4

Answer 1

The center is (0,0) and the radius is 2

Explanation:

The equation of a circle is

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

x^2+y^2=4

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

The center is (0,0) and the radius is 2