**Naming types of angles** *KS2 Revision*

## What you need to know

**Things to remember:**

- Compare the angle you have to a right angle and straight line
- Remember the types of angle above

We start with two important angles, 90 degrees and 180 degrees. These have special names.

The **right angle.**

The right angle is exactly 90° and is shown with a little square.

The **straight line**.

The angle of a straight line is exactly 180°

We have three other types of angles, which we define using the **right angle** and **straight line**.

The **acute angle**

It is between 0° and 90° (smaller than a right angle)

The **obtuse angle**

It is between 90° and 180°

(Between a right angle and straight line)

The **reflex** **angle**

It is between 180° and 360°

(Between a straight line and full turn)

## Example Questions

**Question 1:** Which triangle angle is the right angle?

Answer

Angle A is the right angle.

**Question 2:** Which angle is the reflex angle?

Answer

Angle C is the reflex angle.