Note that the sum of the angles in a triangle is 180 degrees
Since we already have the measurement of two angles :
59 and 46
The third angle will be :

So we have :

Note that the sides opposite to the angles are :

Also note that, the measurement of the sides are proportional to their corresponding angles.
Since :

The sides are :

Therefore the correct order from longest to shortest is :
PQ - QR - PR