Question

HOW TO ROTATE AROUND A POINT THAT IS NOT THE ORIGIN

Answer 1

Rotate point (x,y) around fixed point (h,k)
\[x' = h + [(x-h)\cos \theta -(y-k)\sin \theta]\]
\[y' = k+ [(x-h) \sin \theta +(y-k) \cos \theta]\]

http://en.wikipedia.org/wiki/Rotation_(mathematics)#Two_dimensions