How do you find the angle of rotation of a regular polygon

N = number of sides
R = angle of rotation

It turns out that 
R = 360/n
since there are 360 degrees in a full rotation, which is then split up equally into n
different pieces

For example, a regular quadrilateral (aka "square") has n = 4 so 
R = 360/n = 360/4 = 90
meaning we an rotate a square 90 degrees to have it line up with itself. Every 90 degree rotation, this will happen. 

Note: This trick only works with regular polygons