Year 8

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## Lesson details

### Key learning points

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

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

Q1.

What is the area of circle a?

14pi

7pi

Q2.

What is the area of circle b?

2 pi

4 pi

Q3.

What is the area of circle c?

10 pi

100 pi

5 pi

Q4.

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

12 pi

24pi

36pi

Q5.

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

144 pi

36 pi

6 pi

### 5 Questions

Q1.

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

15.7

246.7

31.4

Q2.

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

201.1

25.1

Q3.

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

3.2

6.3

6.4

Q4.

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

2.8 cm

3.2cm

8.0cm

Q5.

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

12pi

5184pi

6pi