# Regular interior and exterior angles (and mean of irregular)

In this lesson, you will learn how to calculate the mean interior and exterior angles of n-sided polygons, and solve problems based on these formulae.

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

- Click "Close Video"
- Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

# Lesson summary: Regular interior and exterior angles (and mean of irregular)

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The next lesson in Angles in polygons is "Generalising and comparing generalisations"