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Steps of Construction:

1. We draw a triangle PQR of given dimensions.

2. We draw a perpendicular bisector of side QR which intersects QR at D.

3. Join P to D.

4. Draw a line parallel to AC through B by completing the parallelogram AQBC.

5. As we have to draw a rectangle. The perpendicular bisector through D can be used.

6. The perpendicular bisector cuts parallel line through P at E.

7. From E, cut an arc of length DR on the parallel line.

8. Mark the point as F.

9. Join F to R.

10. EFRD is the required rectangle.