# Finding missing angles in polygons

In this lesson, we will learn how to find an unknown angle in a polygon.

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Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.If I split a 7 sided shape into 5 triangles, I have done the correct process to find the total interior angles within the shape.

1/5

Q2.Which of the following WOULD give you the total interior angles within a n-sided polygon?

2/5

Q3.Which of the following WOULD NOT give you the total interior angles of a n-sided polygon?

3/5

Q4.The sum of the total interior angles in a 30 sided shape is...

4/5

Q5.What would be the correct calculation to work out the total sum of the interior angles in a decagon?

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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

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

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.If I split a 7 sided shape into 5 triangles, I have done the correct process to find the total interior angles within the shape.

1/5

Q2.Which of the following WOULD give you the total interior angles within a n-sided polygon?

2/5

Q3.Which of the following WOULD NOT give you the total interior angles of a n-sided polygon?

3/5

Q4.The sum of the total interior angles in a 30 sided shape is...

4/5

Q5.What would be the correct calculation to work out the total sum of the interior angles in a decagon?

5/5

# 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.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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

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

# Finding missing angles in polygons

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

Q1.A triangle is made up of the following: 73 degrees, 51 degrees and x degrees. Solve for x.

1/5

Q2.If a quadrilateral contains 3 right angles, what must the final angle be to form a quadrilateral?

2/5

Q3.If the angles in a decagon are the following: 73 degrees, 293 degrees, 203 degrees, 9 degrees, 29 degrees, 184 degrees, 173 degrees, 93 degrees, 208 degrees, y degrees. Solve for y.

3/5

Q4.Is it possible to have two obtuse angles in a triangle?

4/5

Q5.You are told that V + W + X + Y + Z = total interior sum of a pentagon. If V = 90 degrees, W = 110 degrees, X = 10 degrees, Y = 300 degrees, what would Z be?

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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

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

# Finding missing angles in polygons

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

Q1.A triangle is made up of the following: 73 degrees, 51 degrees and x degrees. Solve for x.

1/5

Q2.If a quadrilateral contains 3 right angles, what must the final angle be to form a quadrilateral?

2/5

Q3.If the angles in a decagon are the following: 73 degrees, 293 degrees, 203 degrees, 9 degrees, 29 degrees, 184 degrees, 173 degrees, 93 degrees, 208 degrees, y degrees. Solve for y.

3/5

Q4.Is it possible to have two obtuse angles in a triangle?

4/5

Q5.You are told that V + W + X + Y + Z = total interior sum of a pentagon. If V = 90 degrees, W = 110 degrees, X = 10 degrees, Y = 300 degrees, what would Z be?

5/5

# Lesson summary: Finding missing angles in polygons

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## Time to move!

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For 5 mins...

Move around:
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On the spot:
Chair yoga