Steps of Constructions:
1. Construct ΔGLD using SSS construction method.
2. With L as the centre, draw an arc of radius 7.5 cm.
3. With D as the centre, draw an arc of radius 10 cm. These two arcs intersect at a point.
4. Since O lies on both the arcs, O is the point intersection of the two arcs.
5. Join LO and GO and complete GOLD.
6. GOLD is the required quadrilateral.