center of a circle

Question

identify the center and radius of X^2 + Y^2 = 49.

Answer 1

Given equation x^2+y^2 = 49

Standard form of a circle equation is (x-h)^2+(y-k)^2 = r^2

Here (h,k) = (0,0) r = 7.

Centere of given circle is origin.