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Name Triangles and Angles Correctly

In this worksheet, students will name the different types of angles and triangles.

'Name Triangles and Angles Correctly' worksheet

Key stage:  KS 2

Year:  Year 4 Maths worksheets

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Compare Geometric Shapes

Popular topics:   Geometry worksheets

Difficulty level:  

Worksheet Overview

In this activity, we will be investigating angle sizes and types of angles. 


Here are a few important facts we need to know for our work with triangles!


right angle is 90º


An acute angle is less than 90º




An obtuse angle is between 90º and 180º




straight line angle is 180º


reflex angle is between 180º and 360º


girl thinking



A right-angled triangle has one 90º angle.


Right-Angled Triangle


An isosceles triangle has two equal angles.


Isosceles Triangle


An equilateral triangle has three equal angles, each of size 60º


Equilateral Triangle


A scalene triangle has three different angles.


Scalene Triangle


Let's try an example question. 



Perry draws an angle of 72°

What type of angle is this?



Angles smaller than 90° are acute. 

Perry's angle is acute.


If you want to see this introduction again, just click on the red help button that will appear on the screen.


Let's get practising!


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