Exercise 4 Page 462

Let's name all the angles in the diagram.

Supplementary angles are two angles whose measures have a sum of 180^(∘). From the diagram, we can identify four linear pairs. ∠ PWT &and ∠ PWV ∠ PWV &and ∠ VWQ ∠ VWQ &and ∠ TWQ ∠ TWQ &and ∠ PWT The sum of a linear pair is 180^(∘), so any of the four linear pairs would do. Let's go with ∠ PWT and ∠ PWV.