topic badge

11.03 Measure angles

Lesson

Are you ready?

Can you estimate the size of an angle? This can be useful skill when checking our measurements are reasonable.

Estimate the size of the angle made by the mountains at the centre.

  1. Greater than $90^\circ$90°

    A

    Less than $45^\circ$45°

    B

    Equal to $180^\circ$180°

    C

    Greater than $90^\circ$90°

    A

    Less than $45^\circ$45°

    B

    Equal to $180^\circ$180°

    C

 

Learn

This video shows you how to use a protractor to measure acute, obtuse and reflex angles.

Apply

What is the angle being measured by this protractor?

  1. $\editable{}$ degrees

 

Remember!

The protractor has two sets of numbers, make sure you are reading off the value of the angle from the right set.  

What is Mathspace

About Mathspace