# Calculate Missing Angles on a Straight Line

In this worksheet, students will 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

In this activity, we will learn about calculating the unknown angle on a straight line.

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

This diagram shows that 180° is half a complete revolution.

Notice that 35° + 145° = 180°

Let's try an example question together!

Example

Find the missing angle in degrees.

The missing angle is 180° - 65° = 115°

Let's have a go at some questions.

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