Find missing lengths in similar separate shapes

In this lesson, we will use scale factors to find missing side lengths in similar shapes. We will practise using our knowledge of proportion to calculate missing lengths.

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.Which shape is similar to shape A?

1/3

Q2.Are the two shapes similar?

2/3

Q3.Are the two shapes similar?

3/3

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.Which shape is similar to shape A?

1/3

Q2.Are the two shapes similar?

2/3

Q3.Are the two shapes similar?

3/3

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.

Quiz:

Find missing lengths in similar separate shapes

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

Q1.The two shapes are similar. What is the scale factor of the enlargement?

1/3

Q2.These two shapes are similar, what is the length of side marked x?

2/3

Q3.These two shapes are similar, what is the length of side marked x?

3/3

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:

Find missing lengths in similar separate shapes

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

Q1.The two shapes are similar. What is the scale factor of the enlargement?

1/3

Q2.These two shapes are similar, what is the length of side marked x?

2/3

Q3.These two shapes are similar, what is the length of side marked x?

3/3

Lesson summary: Find missing lengths in similar separate shapes

It looks like you have not completed one of the quizzes.

To share your results with your teacher please complete one of the quizzes.

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