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

In this lesson, we 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

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# 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.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Regular interior and exterior (and mean of irregular)

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.The mean interior angle of a quadrilateral is...

1/5

Q2.The mean exterior angle of a pentagon is...

2/5

Q3.If I have a regular polygon with an exterior angle of 5 degrees, how many sides does my polygon have?

3/5

Q4.A square would have both an interior and exterior angle of 90 degrees

4/5

Q5.If I had a shape with 180 sides, what would the mean exterior angle be?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Regular interior and exterior (and mean of irregular)

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.The mean interior angle of a quadrilateral is...

1/5

Q2.The mean exterior angle of a pentagon is...

2/5

Q3.If I have a regular polygon with an exterior angle of 5 degrees, how many sides does my polygon have?

3/5

Q4.A square would have both an interior and exterior angle of 90 degrees

4/5

Q5.If I had a shape with 180 sides, what would the mean exterior angle be?

5/5

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

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Climb stairs

On the spot:
Dance