The smart way to improve grades

Comprehensive & curriculum aligned

Affordable pricing from £10/month

Triangles: Calculate Unknown Angles

In this worksheet, students use their knowledge of the properties of a triangle to evaluate unknown angles.

'Triangles: Calculate Unknown Angles' worksheet

Key stage:  KS 2

Curriculum topic:  Geometry: Properties of Shapes

Curriculum subtopic:  Compare Shape Properties

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

In this worksheet, calculate the unknown angle in a triangle.

 

Question:

Calculate the unknown angle in the triangle.

Triangle5462

Answer:   

The angles in any triangle add to 180°.

Angle = 180° - 54° - 64° = 62°

The unknown angle is 62°.

Calculate the unknown angle.

Triangle7766

Calculate the unknown angle.

Triangle6979

Calculate the unknown angle.

Triangle8752

Calculate the unknown angle.

Triangle7467

Calculate the unknown angle.

Triangle2284

Calculate the unknown angle.

Triangle2690

Calculate the unknown angle.

Triangle8669

Calculate the unknown angle.

 

Triangle5462

Calculate the unknown angle.

Triangle7766

Calculate the unknown angle.

Triangle8752

  • Question 1

Calculate the unknown angle.

Triangle7766

CORRECT ANSWER
37
EDDIE SAYS
180 - 77 - 66 = 37
  • Question 2

Calculate the unknown angle.

Triangle6979

CORRECT ANSWER
32
EDDIE SAYS
180 - 69 - 79 = 32
  • Question 3

Calculate the unknown angle.

Triangle8752

CORRECT ANSWER
41
EDDIE SAYS
180 - 87 - 52 = 41
  • Question 4

Calculate the unknown angle.

Triangle7467

CORRECT ANSWER
39
EDDIE SAYS
180 - 74 - 67 = 39
  • Question 5

Calculate the unknown angle.

Triangle2284

CORRECT ANSWER
74
EDDIE SAYS
180 - 22 - 84 = 74
  • Question 6

Calculate the unknown angle.

Triangle2690

CORRECT ANSWER
64
EDDIE SAYS
180 - 90 - 26 = 64
  • Question 7

Calculate the unknown angle.

Triangle8669

CORRECT ANSWER
25
EDDIE SAYS
180 - 86 - 69 = 25
  • Question 8

Calculate the unknown angle.

 

Triangle5462

CORRECT ANSWER
62
EDDIE SAYS
180 - 54 - 64 = 62
  • Question 9

Calculate the unknown angle.

Triangle7766

CORRECT ANSWER
37
EDDIE SAYS
180 - 77 - 66 = 37
  • Question 10

Calculate the unknown angle.

Triangle8752

CORRECT ANSWER
41
EDDIE SAYS
180 - 87 - 52 = 41
---- 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.

Get started
laptop

Start your £1 trial today.
Subscribe from £10/month.