What is the radius of a circle whose equation is x2 + (y – 8)2 = 25?

5

The equation of a circle is (x-h)^2 + (y-k)^2 = r^2, where (h, k) is the center of the circle and r is the radius.

In this case, the center of the circle is (0,8) and the radius is sqrt(25) = 5.