Angles in polygons

In this lesson, we will review that the total interior angles of polygons are made up of many triangles, and that this relationship is determined by the number of sides the polygon has.

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.

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.The total sum of the interior angles in a triangle is...

1/5

Q2.A right angled triangle with one angle as 23 degrees would mean the remaining interior angle would be...

2/5

Q3.In an equilateral triangle, each interior angle would be equal to...

3/5

Q4.If a base angle of an isosceles triangle was 34 degrees, what would the other base angle be?

4/5

Q5.If the base angles of an isosceles triangle were 34 degrees, what would the unknown angle 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.

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.The total sum of the interior angles in a triangle is...

1/5

Q2.A right angled triangle with one angle as 23 degrees would mean the remaining interior angle would be...

2/5

Q3.In an equilateral triangle, each interior angle would be equal to...

3/5

Q4.If a base angle of an isosceles triangle was 34 degrees, what would the other base angle be?

4/5

Q5.If the base angles of an isosceles triangle were 34 degrees, what would the unknown angle be?

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.

Quiz:

Angles in polygons (review)

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.

Quiz:

Angles in polygons (review)

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: Angles in polygons

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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