: Question 9    Use the space below to construct a triangle PQR whose perimeter is
                     120 mm and the two base angles are 45o and 30o respectively.

The perimeter 120 mm should be drawn first.  Then the two angles namely 45o and 30o are constructed from the two ends respectively.  Points P, Q and R are then determined by parallel lines to sides AC and BC.  The point Q is determined by the intersection of the bisectors of the two angles.  The solution is shown below: