let ABDE and BCGH be squares lying outside the traingle ABC. The centres of these sqaures are P & Q respecitvely, and the midpoints of the line segments AC and DH are R & S respectively. Show that the points P,Q,R,S are vertices of a square??? any ideas on how to do this please? the only hint i have is to show that P-S = R-Q = i(R -P) where i = imaginary..