What's the radius of each circle x^2 + (y-3) ^2=25

Radius = 5.

Step-by-step explanation:

Compare this with the following general form of a circle:

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

x^2 + (y - 3) ^2 = 25

We see that the radius (r) = sqrt 25 = 5.