# Use Pythagoras' Theorem with Isosceles Triangles

In this lesson, we will learn how to apply Pythagoras' Theorem to isosceles triangles to find missing side lengths or angles.

#### 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.Find the distance between (0, 0) and (5, 12).

1/4

Q2.Find the distance between the points (1, 3) and (6, 2).

2/4

Q3.Find the distance between the points (4, 3) and (-3, -4).

3/4

Q4.Find the distance between the points (-7, -3) and (5, -11).

4/4

#### 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.Find the distance between (0, 0) and (5, 12).

1/4

Q2.Find the distance between the points (1, 3) and (6, 2).

2/4

Q3.Find the distance between the points (4, 3) and (-3, -4).

3/4

Q4.Find the distance between the points (-7, -3) and (5, -11).

4/4

# 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:

# Use Pythagoras’ theorem with Isosceles Triangles

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

Q1.Find the length labelled x.

1/3

Q2.Find the length labelled x.

2/3

Q3.Find the area of the triangle.

3/3

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

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

# Use Pythagoras’ theorem with Isosceles Triangles

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

Q1.Find the length labelled x.

1/3

Q2.Find the length labelled x.

2/3

Q3.Find the area of the triangle.

3/3

# Lesson summary: Use Pythagoras' Theorem with Isosceles Triangles

## 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