Geometry

First, let's find the radius of the circle. We simply have

$25 \pi = \pi *r^2 \\ 25 = r^2 \\r = 5$

Let's let R be the radius of the sphere. 

$R^2 = [ 5^2 + r^2 ] = [ 5^2 + 5^2 ] = 50$

Now, we can calculate the surface area of the sphere. We have

$4 \pi R^2 = \\ 4 \pi * 50 = \\ 200 \pi$

So, the answer is $200 \pi$

Thanks! :)