Year 8

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## Lesson details

### Key learning points

- In this lesson, we will learn how to calculate the arc length for fractions of circles.

### 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.

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

### 6 Questions

Q1.

If the diameter of a circle is 20. What is the circumference?

10 pi

100 pi

Q2.

If the circumference of a circle is 14 pi. What is the radius?

14

28

Q3.

What is the arc length for a?

15.7

1800

5 pi

Q4.

What is the arc length for b?

20

20 pi

5

Q5.

What is the arc length for c?

15

7.5

Q6.

What is the arc length for d?

2

4