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Right angles, acute and obtuse angles

Tutor: Holly

# Right angles, acute and obtuse angles

## ​​In a nutshell

Angles are measured in degrees ($\degree$). A right angle measures 90$\degree$, and can be used to describe turns.

## Right angles and turns

A right angle measures 90$\degree$. You can measure angles with a protractor. A right angle can also be described as a quarter of a turn.

If you turn around once fully, you will have turned 360$\degree$. Therefore:

• 1 right angle makes a quarter turn.
• 2 right angles make a half-turn.
• 3 right angles make three quarters of a turn.
• 4 right angles make a full turn.

Note: A half-turn (180$\degree$) is also called an "angle on a straight line".

## ​​​​Other angles

Apart from right angles, there are other angles to consider:

Acute angles are less than 90$\degree$:

Obtuse angles are greater than 90$\degree$ but less than 180$\degree$:

Reflex angles are more than 180$\degree$ but less than 360$\degree$:

Here are all the angles together:

## FAQs - Frequently Asked Questions

### How many right angles make a half-turn?

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