# Straight Lines: What's the Unknown Angle?

In this worksheet, students calculate the unknown angle on a straight line.

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Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   2D Shapes: Circles, Angles and Bearings

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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