# Angles in triangles

In this lesson, we will review that the internal angles in a triangle sum to 180 degrees.

# 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.

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

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

# Angles in 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 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

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

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

# Angles in 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 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

# Lesson summary: Angles in triangles

## Time to move!

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

For 5 mins...

Move around:
Jog

On the spot:
Chair yoga