# Four-sided Figures: Finding Unknown Angles - Part 2

*Example:*

*Example:*

Find the unknown marked angles in the trapezium below.

The sum of a pair of angles between two parallel lines is 180°.∠p + ∠s = 180°

∠p= 180° - 62° =118°

From the data given, it is not possible to find ∠r.