First of all, we draw a rough sketch of the given measurements :

Steps of Construction
- First of all, we draw a line segment PQ = 7.5 cm.
- Draw an arc of radius 6 cm. from point P and an arc of radius 10 cm. from point Q intersecting each other at S. Join PS and QS. So, we obtained triangle PQS.
- Draw, an arc of 6 cm. from point P and an arc of radius 7.5 cm. from point Q intersecting each other at R. Join PR, QR, and SR.
Thus, we obtained the required quadrilateral PQRS:
