Ali was asked to construct a square for which, the diagonal alone is given (length known) and nothing else. He was given a compass and a straight edge (a ruler with NO markings). The square is ACBD. P is said to be the point of intersection of the diagonals of the square. Which of the following is constructed as a first step in this construction?
AC or CD, P, AP or PB or OC or OD
Steps of Construction:
Take the line segment of length AB (the diagonal) and draw the perpendicular bisector of this segment. Let this perpendicular cut AB at P.
With P as the centre and radius AP, cut arcs C and D on the perpendicular bisector. Join AC and AD, BC and BD. We have the square.