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Practise Ordering Angles and Identifying Regular and Irregular Shapes

In this worksheet, students will order angles up to 180° by size and identify whether shapes are regular or irregular.

'Practise Ordering Angles and Identifying Regular and Irregular Shapes' worksheet

Key stage:  KS 2

Year:  Year 4 Maths worksheets

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Identify Acute/Obtuse Angles

Difficulty level:  

Worksheet Overview

In this activity, we will practise spotting acute and obtuse angles in regular and irregular shapes. 

 

Acute angles are less than 90° and are the smallest type of angle - (that's why they are 'a cute' type of angle!)

 

happy girl

 

Obtuse angles are a bit bigger - more than 90°, but less than 180°

 

Shapes that contain angles and sides that are all equal are called regular.

 

regular shapes

 

Shapes that contain angles and sides that are not all equal are irregular.

 

irregular shapes

 

Let's try some example questions.

 

Example 1

Order these angles from smallest to largest.

 

(A) Obtuse (B) Obtuse (C) Acute

 

Answer

C is the smallest angle, followed by A and then B. 

The correct order is C, A, B.

 

Example 2

Carrie draws a rectangle. 

Is her shape regular or irregular?

 

Answer

A rectangle does have four equal angles. 

But, it does not have four equal sides. 

It is irregular.

 

Are you ready to have a go at spotting some angles?

 

girl with magnifying glass

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