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Geometry: Name the Triangle

In this worksheet, students work out the missing angle in a triangle in order to identify the type of triangle.

'Geometry: Name the Triangle' 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

Remember that the interior angles of a triangle add up to 180º.

 

right-angled triangle has one 90º angle.

An isosceles triangle has two equal angles.

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

scalene triangle has no equal angles.

 

Example

Two of the angles in a triangle are 35º and 110º.  Which type of triangle is it?

 

Answer

We must first work out the third angle which will be:

180º - (35º + 110º) = 180º - 145º = 35º

 

So the triangle has angles 35º , 110º, 35º 

 

Two angles are equal so it is isosceles.

 

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