# Finding a formula

In this lesson, we will look at different formulas for area of a circle and combine your knowledge with the work on circumference.

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.What is the area of circle a? 1/5

Q2.What is the area of circle b? 2/5

Q3.What is the area of circle c? 3/5

Q4.What is the area of a circle with radius of 12?

4/5

Q5.What is the area of a circle with a diameter of 6?

5/5

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.What is the area of circle a? 1/5

Q2.What is the area of circle b? 2/5

Q3.What is the area of circle c? 3/5

Q4.What is the area of a circle with radius of 12?

4/5

Q5.What is the area of a circle with a diameter of 6?

5/5

# 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.

Quiz:

# Finding a formula

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

Q1.What is the area of a circle with radius 5cm to 1d.p?

1/5

Q2.What is the circumference of a circle with radius 8cm to 1d.p?

2/5

Q3.What is the diameter of a circle with a circumference 40m?

3/5

Q4.The area of a circle is 25 cm squared. What is the diameter

4/5

Q5.The area of a circle is 144 pi. What is the circumference?

5/5

Quiz:

# Finding a formula

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

Q1.What is the area of a circle with radius 5cm to 1d.p?

1/5

Q2.What is the circumference of a circle with radius 8cm to 1d.p?

2/5

Q3.What is the diameter of a circle with a circumference 40m?

3/5

Q4.The area of a circle is 25 cm squared. What is the diameter

4/5

Q5.The area of a circle is 144 pi. What is the circumference?

5/5

# Lesson summary: Finding a formula

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Dance