  # Straight Lines: What's the Unknown Angle?

In this worksheet, students calculate the unknown angle on a straight line. Key stage:  KS 2

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Identify Angles at a Point

Popular topics:   Angles worksheets, Geometry worksheets

Difficulty level:   #### Worksheet Overview

This activity is about calculating the unknown angle on a straight line.

The angles at a point on a straight line add up to 180°.

180° is half a complete revolution. Notice that 35° + 145° = 180°

e.g. Find the missing angle in degrees. The missing angle is 180° - 65° = 115°

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