Quote - Basic geometry skills?

The mirror, the object, and the camera form a triangle.  You know their locations (x/z coordinates) to be able to determine the lengths of each side.  Link to equation.

From that you can get an angle.  Then you can use said angle (solve for mirror's location) to figure out which angle the mirror needs to be pointed in order to see the reflection from the camera.

Thanks, this is the information I think will work best. The problem is I am not too good with geometry...out of practice for years. I looked at the site you gave and it didn't make sense to me. Let me ask how to get the side lengths of the triangle.

If point a (mirror) is at lets say 4x and 3z and point b (object) was at 9x and 2z with point c (camera) at 9x and 6z I would be able to determin the distance between each object by ??? How do I get the side lengths?