# Area of a circle

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## Lesson details

### Key learning points

- In this lesson, we will learn to calculate the area of a circle using a radius or diameter. We will also learn how to work backwards from the area of a circle to determine the radius and diameter.

### 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.

Pi is approximately...

1.41

2.71

4.59

Q2.

If a circle has radius 5, then the circumference is approximately...

15.7

16.2

27.1

Q3.

Find the perimeter of a.

15+2.5pi

15+5pi

20+5pi

Q4.

Find the perimeter of b.

36+20pi

36+5pi

56 + 20pi

56+10pi

Q5.

Find the perimeter of c.

36pi + 48

72pi + 24

72pi + 48

### 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