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Calculate Missing Angles on a Straight Line

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

'Calculate Missing Angles on a Straight Line' worksheet

Key stage:  KS 2

Year:  Year 5 Maths worksheets

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.

 

Angles on a straight line 180

 Notice that 35° + 145° = 180°

 

Let's try an example question together!

 

Example

Find the missing angle in degrees.

 

Find the missing angle on a straight line

 

Answer

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

 

Let's have a go at some questions.

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