What can rotation values imply on a sphere?

[matia]

Hello,
I have a sphere (actually an image warping a sphere) I know the rotation values,
can I get the sphere radius by these parameters ?

 

[HallsofIvy]

What do you mean by "rotation values"?

 

[matia]

I have an image projected on a plane tanget to a sphere, I know the camera rotation values over x,y,z... I need the sphere radius inorder to know where the z axis (of the sphere) intersects with the plane (I can assume its (0,0,Z) , x,y =0, but I need Z).
Thanks