I've attached a sketch so you can see how the construction should be done:
1. Connect corresponding original and image points.
2. The perpendicular bisectors of these connections intersect at the center of the rotation.
3. Connect the center of the rotation with corresponding original and image points and determine the angle of rotation.
I actually gave you "some" help. If it wasn't enough you should tell us where and why you got stuck.
You don't expect me to present you a complete solution, do you?
So once again: What didn't you understand, what did you do by yourself to find a (the) solution?