# Recognise Right Angles

In this worksheet, students will decide whether an angle is larger or smaller than a right angle using the words acute and obtuse.

Key stage:  KS 2

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Recognise Angles

Difficulty level:

#### Worksheet Overview

In this activity, we'll take a look at types of angles.

A right angle is an angle that is equal to 90°.

Here is a right angle.

We can see it's marked with a rectangle corner marker.

If you see an angle marked with a square or rectangle, it's a right angle.

An acute angle is an angle that is smaller than 90°.

Here is an acute angle.

An obtuse angle is an angle that is larger than 90°.

Here is an obtuse angle.

Let's look at an example question.

Example

How many of the angles shown below are acute?

An acute angle is smaller than a right angle.

Three of the triangles shown are acute (smaller than a right angle).

Now it's your turn to have a go at some questions.

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