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:


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.

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