Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

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

Year:  Year 4 11+ worksheets

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   2D Shapes: Triangles, Quadrilaterals and Polygons

Difficulty level:  

Worksheet Overview

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



Calculate the unknown angle in the triangle.



The angles in any triangle add to 180°.

Angle = 180° - 54° - 64° = 62°

The unknown angle is 62°.

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

Try an activity or get started for free