# Area of a circle

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## Lesson details

### Key learning points

1. 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.

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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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## Worksheet

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## Starter quiz

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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

## Exit quiz

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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