# Find Angles in Triangles and on Parallel Lines

In this worksheet, students will use angle rules to work out the missing angles in triangles and on parallel lines.

Key stage:  KS 3

Curriculum topic:   Geometry and Measures

Curriculum subtopic:   Understand the Relationship Between Parallel Lines and Angles

Difficulty level:

#### Worksheet Overview

Look at the following diagram.

Angle a° = 58° because it is alternate to the 58° on parallel lines (Z or S shape)

Angle b° = 48° because it is alternate to the 48° on parallel lines (Z or S shape)

Angle c° = 180° - 48° - 58° = 74° for two reasons.....angles in a triangle add up to 180° and angles on a straight line add up to 180°

Angle d° = 180° - 58° = 122° because angles on a straight line add up to 180°

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