# Building shapes from triangles (Part 2)

In this lesson, we will learn how to arrange triangles to form polygons as part of an investigation into the internal angles of polygons. This represents part 2 of a two-part lesson.

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

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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.Each angle in an equilateral triangle is...

1/5

Q2.Which of the following statements most accurately describes an 'acute angle'?

2/5

Q3.The total interior angles in a quadrilateral sum to...

3/5

Q4.If I wanted to describe a regular triangle, it would be better to say which of the following?

4/5

Q5.If you were to have 6 separate equilateral triangles , what would the total interior angles of all the triangles sum to?

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.Each angle in an equilateral triangle is...

1/5

Q2.Which of the following statements most accurately describes an 'acute angle'?

2/5

Q3.The total interior angles in a quadrilateral sum to...

3/5

Q4.If I wanted to describe a regular triangle, it would be better to say which of the following?

4/5

Q5.If you were to have 6 separate equilateral triangles , what would the total interior angles of all the triangles sum to?

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:

# Building shapes from triangles (Part II)

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

Q1.ABCD forms a quadrilateral. What are the total interior angles of the quadrilateral?

1/5

Q2.Angle ABC is 98 degrees. What would the size of the reflex angle formed be on the exterior?

2/5

Q3.If I combined two equilateral triangles together with a shared side, what would the shape formed be called?

3/5

Q4.Which of the following is not a rule used so far for angles?

4/5

Q5.If A + B + C = 180, D + E = 180 and F is a right angle, what does A + B + C + D + E + F equal?

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:

# Building shapes from triangles (Part II)

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

Q1.ABCD forms a quadrilateral. What are the total interior angles of the quadrilateral?

1/5

Q2.Angle ABC is 98 degrees. What would the size of the reflex angle formed be on the exterior?

2/5

Q3.If I combined two equilateral triangles together with a shared side, what would the shape formed be called?

3/5

Q4.Which of the following is not a rule used so far for angles?

4/5

Q5.If A + B + C = 180, D + E = 180 and F is a right angle, what does A + B + C + D + E + F equal?

5/5

# Lesson summary: Building shapes from triangles (Part 2)

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## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Dance