Year 8

## Switch to our new maths teaching resources

Slide decks, worksheets, quizzes and lesson planning guidance designed for your classroom.

Play new resources video

## Lesson details

### Key learning points

- In this lesson, we will calculate the perimeter of shapes involving 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.

Loading...

### 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

### 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