# Circumference of a circle

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## Lesson details

### Key learning points

- In this lesson, we will learn about the relationship between the circumference and the 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.

What is the name of the green area?

Chord

Sector

Q2.

What is the length of the diameter?

5cm

7cm

Q3.

What is the length of the radius?

10cm

12.5cm

25cm

Q4.

A _________ is a straight line outside a circle that touches one point of the circumference.

Arc

Chord

Radium

Q5.

An __________ is part of the circumference of the circle

Chord

Radium

Tangent

### 5 Questions

Q1.

Approximately how many times bigger is a circumference than a diameter?

1.59

3.41

4.15

Q2.

What is the circumference of this circle?

16 pi

4 pi

Q3.

What is the circumference of this circle?

16 pi

4 pi

Q4.

What is the value of the missing length if the circumference is 81 pi.

254

40.5

9

Q5.

What is the value of the missing length if the circumference is 36 pi.

133

36

6