The figure below shows a partially-completed set of steps to construct parallelogram PQRS: Two sides of a parallelogram PQRS are drawn. PQ makes an acute angle with the horizontal side QR. QR extends to the left, and an arc is drawn that cuts this extended line at L and the side QP at M. An arc of the same measure and the same orientation as arc LM is drawn from point R to cut QR at N. Another small arc intersects this arc at T. The position of T is such that a line segment drawn through RT makes the same angle with QR as angle LQM.

The next step is to construct side RS of the parallelogram so that side RS is congruent to side PQ. The chart below shows the steps each of the four students took to draw side RS of the parallelogram: