Question 300556
Find the center and radius of each circle:
x2 + y2 = 36

The standard form for a circle with center at (h,k) and radius r is:

(x-h)^2 + (y-k)^2 = r^2

Since x^2 + y^2 = 36 is the same as:

(x-0)^2 + (y-0)^2 = 6^2

this cicle has center (0,0) and radius 6.