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Understand Circle Parts

In this worksheet, students will be asked to find parts of a circle, the diameter, radius and circumference.

'Understand Circle Parts' worksheet

Key stage:  KS 2

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Know Circle Parts

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

This activity is going to ask you to complete different questions all about circles.

A circle is a 2D shape, every point on a circle has the same fixed distance from the centre.

 

In Year 6, we learn about the parts of a circle.

Let's recap:

 

Diameter

This circle shows the diameter, this is the length of the line through the centre, from one edge to the other.

Circle showing diameter

 

Radius

This circle shows the radius, the radius is the distance from the centre of the circle to the outer edge.

The radius is half of the diameter so is fairly straightforward to calculate.

 

Circle showing radius

 

 

Circumference

A circle's circumference is the distance around the edge.

Circle showing circumference

 

 

How to find the circumference of a circle:

To find the circumference of a circle we have to use the formulae:

 

(2 x Image result for pi symbol x r)

 

Image result for pi symbol = pi = 3.14

 

Example:

Let's find the circumference of this circle...

The radius is 5cm.

(2 x 3.14 x 5) = 

(6.28 x 5) = 31.4

 

The circumference is 31.4cm

Look at this circle.

Which letter shows the circumference?

 

Circle with labels

Look at this circle.

Which letter shows the diameter?

Circle with labels

Look at the circle.

Which letter shows the radius?

Look at the circle.

Can you type the name of the line labelled 'c'?

Circle with labels

Look at the circle.

Can you type the name of the line labelled 'b'?

Circle with labels

Look at this circle.

The radius is 16cm. What is the diameter?

Circle with labels

Look at this circle.

The diameter is 96m. What's the radius?

Circle with labels

Look at this circle.

The radius is 5cm.

 

What is the circumference?

 

The formulae is (2 x Image result for pi symbol x r)

Remember Image result for pi symbol = 3.14

 

Choose the correct answer.

Circle with labels

 

 

30.4 cm

31.04 cm

32.4 cm

31.4 cm

Look at this circle.

The diameter is 22cm.

 

What is the circumference?

 

The formulae is (2 x Image result for pi symbol x r)

Remember Image result for pi symbol = 3.14

 

Choose the correct answer.

Circle with labels

 

 

Look at this circle.

The radius is 14cm.

 

What is the circumference?

 

The formulae is (2 x Image result for pi symbol x r)

Remember Image result for pi symbol = 3.14

 

Write the correct answer.

Circle with labels

 

 

  • Question 1

Look at this circle.

Which letter shows the circumference?

 

Circle with labels

CORRECT ANSWER
c
C
EDDIE SAYS
The letter C shows the circumference as it is the measurement all the way around the circle.
  • Question 2

Look at this circle.

Which letter shows the diameter?

Circle with labels

CORRECT ANSWER
C
c
EDDIE SAYS
This time, letter C represents the diameter. The diameter is the straight line going through the centre of the circle, connecting two points on the circumference.
  • Question 3

Look at the circle.

Which letter shows the radius?

CORRECT ANSWER
B
b
EDDIE SAYS
Did you find it? The radius is labelled as b. The radius is the distance from the centre of the circle to the edge of the circle. The radius is half of the diameter in length.
  • Question 4

Look at the circle.

Can you type the name of the line labelled 'c'?

Circle with labels

CORRECT ANSWER
Diameter
The diameter
EDDIE SAYS
Remember the long line that runs through the centre of the circle is called the diameter! Are you feeling more confident?
  • Question 5

Look at the circle.

Can you type the name of the line labelled 'b'?

Circle with labels

CORRECT ANSWER
Radius
The radius
EDDIE SAYS
Remember the line that runs from the centre of the circle to the edge of the circle is called the radius.
  • Question 6

Look at this circle.

The radius is 16cm. What is the diameter?

Circle with labels

CORRECT ANSWER
EDDIE SAYS
The diameter is 32cm in length as it's double the length of the radius! 16 x 2 = 32
  • Question 7

Look at this circle.

The diameter is 96m. What's the radius?

Circle with labels

CORRECT ANSWER
EDDIE SAYS
The radius is 48m in length as it's half the length of the radius. 96/2 = 48
  • Question 8

Look at this circle.

The radius is 5cm.

 

What is the circumference?

 

The formulae is (2 x Image result for pi symbol x r)

Remember Image result for pi symbol = 3.14

 

Choose the correct answer.

Circle with labels

 

 

CORRECT ANSWER
31.4 cm
EDDIE SAYS
It's tricky to find the circumference of a circle! The calculation needed was: (2 x 3.14 x 5) = 31.4cm
  • Question 9

Look at this circle.

The diameter is 22cm.

 

What is the circumference?

 

The formulae is (2 x Image result for pi symbol x r)

Remember Image result for pi symbol = 3.14

 

Choose the correct answer.

Circle with labels

 

 

CORRECT ANSWER
EDDIE SAYS
This time you first needed to halve the diameter of 22cm to find the radius of 11cm. The calculation needed was: (2 x 3.14 x 11) = 69.08cm Hopefully, by now you're feeling more confident.
  • Question 10

Look at this circle.

The radius is 14cm.

 

What is the circumference?

 

The formulae is (2 x Image result for pi symbol x r)

Remember Image result for pi symbol = 3.14

 

Write the correct answer.

Circle with labels

 

 

CORRECT ANSWER
87.92
EDDIE SAYS
This time, you had to do all of the hard work! The calculation needed was: (2 x 3.14 x 14) = 87.92cm Great work, you've completed another activity! How about attempting another one so you feel super confident?
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