Four-sided Figures: Finding Unknown Angles - Part 2
1. Find the unknown marked angles in the trapezium below.
![geometry finding unknown angles in a 4-sided figure](/images/notes/four_sided_figure_finding_angles_2.png)
∠p + ∠s = 180°
∠p = 180° − 62° = 118°
∠p = 180° − 62° = 118°
The sum of a pair of angles between two parallel lines is 180°.
From the data given, it is not possible to find ∠r.