The smart way to improve grades

Comprehensive & curriculum aligned

Affordable pricing from £10/month

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

Curriculum topic:  Geometry: Properties of Shapes

Curriculum subtopic:  Compare Geometric Shapes

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

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

 

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.

 

Two of the angles in a triangle are  70º  and   40º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  50º  and   40º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  50º  and   80º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  50º  and   60º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  30º  and   30º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  60º  and   60º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  45º  and   45º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  45º  and   75º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  56º  and   34º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

Two of the angles in a triangle are  23º  and   134º

Which type of triangle is it?

scalene

right-angled

isosceles

equilateral

  • Question 1

Two of the angles in a triangle are  70º  and   40º

Which type of triangle is it?

CORRECT ANSWER
isosceles
  • Question 2

Two of the angles in a triangle are  50º  and   40º

Which type of triangle is it?

CORRECT ANSWER
right-angled
  • Question 3

Two of the angles in a triangle are  50º  and   80º

Which type of triangle is it?

CORRECT ANSWER
isosceles
  • Question 4

Two of the angles in a triangle are  50º  and   60º

Which type of triangle is it?

CORRECT ANSWER
scalene
  • Question 5

Two of the angles in a triangle are  30º  and   30º

Which type of triangle is it?

CORRECT ANSWER
isosceles
  • Question 6

Two of the angles in a triangle are  60º  and   60º

Which type of triangle is it?

CORRECT ANSWER
equilateral
  • Question 7

Two of the angles in a triangle are  45º  and   45º

Which type of triangle is it?

CORRECT ANSWER
right-angled
  • Question 8

Two of the angles in a triangle are  45º  and   75º

Which type of triangle is it?

CORRECT ANSWER
scalene
  • Question 9

Two of the angles in a triangle are  56º  and   34º

Which type of triangle is it?

CORRECT ANSWER
right-angled
  • Question 10

Two of the angles in a triangle are  23º  and   134º

Which type of triangle is it?

CORRECT ANSWER
isosceles
---- OR ----

Sign up for a £1 trial so you can track and measure your child's progress on this activity.

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Start your £1 trial

Start your trial for £1