# Using a Protractor

This is a protractor, it helps you measure angles (in degrees):

## Protractors are fun and easy to use

Have a look at this animation (press the play button) to see how to make a neat angle using a protractor and ruler:

images/construct.js?mode=pro50

## Measuring

Protractors usually have two sets of numbers going in opposite directions.

Be careful which one you use!

When in doubt think *"should this angle be bigger or smaller than 90° ?"*

## Have a Go Yourself!

Try to measure the angles **A, B** and** C** inside the triangle. Drag the protractor and rotate it using arrow keys.

images/protractor-angle.js

Be careful which angle you read from
the protractor. *Hint: if you get them all correct,
they will add up to 180°*.

1812, 1813, 1814, 1815, 3320, 3321, 3322, 3323, 3324, 3325