Answer:
The center is (0,0) and the radius is 6
Step-by-step explanation:
The equation for a circle can be written in the form
(x-h)^2 + (y-k)^2 = r^2
Where (h,k) is the center and r is the radius
x^2+y^2=36
can be written as
(x-0)^2+(y-0)^2=6^2
The center is (0,0) and the radius is 6
