How to Measure Angles

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The below video covers the written tutorial below - how to measure angles.

How do we measure angles?

We measure angles using a tool called a protractor.

Take the below angle for instance. Roll over it with your mouse to see how to measure the angle.

  1. The vertex of the angle aligns with the center of the protractor.
  2. One arm sits on the horizontal zero line.
  3. The position of the other is used to determine the size of the angle. In this case it is 40 degrees.

What units do we use to measure angles?

You may have already guessed it, but for completion sake we just wanted to mention that angles are measured in degrees. There are 360 degrees in a full turn or circle. Why 360? Check out this branch tutorial. At the end of the day, you don't need to know why there are 360 degrees in a circle - you just need to learn how to use them efficiently. Let's now move on to naming conventions for different types of angles.

Exercise Worksheet

An exercise worksheet is available below to work through to consolidate your understanding of how to measure angles. Click on this image to download the document: