2. Take a point P (not coincident with the origin) on the L 1 ray as the parallel line L3 (on the same side as L2) of the L2 ray.

3. Use a ruler or triangle to draw parallel lines between L 1 and the intersections b and c of L2 and L3.

Or cut equal lengths on L2 and L3 and connect them.

The quadrilateral APBC is a parallelogram.

Seeking adoption is a satisfactory answer.