# Calculate Missing Angles in Quadrilaterals

In this worksheet, students will calculate missing angles in quadrilaterals.

Key stage:  KS 3

Curriculum topic:   Geometry and Measures

Curriculum subtopic:   Derive/Use the Sum of Angles for Deduction

Difficulty level:

#### Worksheet Overview

In this activity, we will find missing angles in quadrilaterals.

Quadrilaterals have four sides and four angles!

The total of all the angles in a triangle is 180o

How would we use this in a question?

Let's try one .......

Example

Find the missing angle A in the quadrilateral.

To find angle A, we add up the existing angles and subtract this from 360°.

A = 360 - (70 + 120 + 65)

A = 360 -  255

A  = 105°

Does that make sense?

Let's have a go at some questions.

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