Polygons and triangles

In this lesson, we will learn that the sum of the interior angles of a polygon can be found using triangles.

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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.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:

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.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

Video

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Worksheet

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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:

Polygons and triangles

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

Q1.The total sum of the interior angles of two triangles would be equal to...

1/5

Q2.If I have a regular pentagon, how many triangles from one distinct point internally can I create?

2/5

Q3.If I have a regular pentagon, what would the total interior angles sum to?

3/5

Q4.If I have a regular octagon, how many triangles from one distinct point internally can I create?

4/5

Q5.If I have a regular octagon, what would the total interior angles 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:

Polygons and triangles

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

Q1.The total sum of the interior angles of two triangles would be equal to...

1/5

Q2.If I have a regular pentagon, how many triangles from one distinct point internally can I create?

2/5

Q3.If I have a regular pentagon, what would the total interior angles sum to?

3/5

Q4.If I have a regular octagon, how many triangles from one distinct point internally can I create?

4/5

Q5.If I have a regular octagon, what would the total interior angles sum to?

5/5

Lesson summary: Polygons and triangles

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