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Circle Parts

In this worksheet, students must know the names of parts of circles, including radius, diameter and circumference and know that the diameter is twice the radius.

'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

A circle can be drawn using a pair of compasses.

The distance set between the point and the pencil tip is called the radius.

The point marks the centre of the circle.

 

Circle and radius

 

The distance straight across from one edge to the other, going through the centre, is called the diameter.

 

Circle and diameter

 

The diameter is twice as long as the radius.

The radius is half the length of the diameter.



When we draw a circle, the pencil line around the perimeter is called the circumference.

It is a curved line.

Circumference

Look at this circle.

Which letter shows the centre?

 

Circle and centre

a

b

c

d

Look at this circle.

Which letter shows the circumference?

 

Circle and circumference

a

b

c

d

Look at this circle.

Which letter shows the radius?

 

Circle and radius

a

b

c

d

Look at this circle.

Which letter shows the diameter?

 

Circle and diameter

a

b

c

d

Look at this circle.

What is the name of the point labeled o ?

 

Circle parts

Look at this circle.

What is the name of the line labeled r ?

 

Circle parts

Look at this circle.

What is the name of the line labeled d ?

 

Circle parts

Look at this circle.

What is the name of the line labeled c ?

 

Circle parts

Look at this circle.

The radius is 5 units long.

How long is the diameter?

(Just write the number.)

 

Radius and diameter

Look at this circle.

The diameter is 22 units long.

How long is the radius?

(Just write the number.)

 

Radius and diameter

  • Question 1

Look at this circle.

Which letter shows the centre?

 

Circle and centre

CORRECT ANSWER
a
EDDIE SAYS
The centre is in the middle of the circle.
  • Question 2

Look at this circle.

Which letter shows the circumference?

 

Circle and circumference

CORRECT ANSWER
d
EDDIE SAYS
The circumference is the perimeter.
  • Question 3

Look at this circle.

Which letter shows the radius?

 

Circle and radius

CORRECT ANSWER
b
EDDIE SAYS
The radius goes from the centre to the circumference.
  • Question 4

Look at this circle.

Which letter shows the diameter?

 

Circle and diameter

CORRECT ANSWER
c
EDDIE SAYS
The diameter goes from edge to edge through the centre.
  • Question 5

Look at this circle.

What is the name of the point labeled o ?

 

Circle parts

CORRECT ANSWER
centre
the centre
EDDIE SAYS
The centre is the point in the middle.
  • Question 6

Look at this circle.

What is the name of the line labeled r ?

 

Circle parts

CORRECT ANSWER
radius
the radius
EDDIE SAYS
The radius goes from the centre to the circumference.
  • Question 7

Look at this circle.

What is the name of the line labeled d ?

 

Circle parts

CORRECT ANSWER
diameter
the diameter
EDDIE SAYS
The diameter goes from edge to edge through the centre.
  • Question 8

Look at this circle.

What is the name of the line labeled c ?

 

Circle parts

CORRECT ANSWER
circumference
the circumference
EDDIE SAYS
The circumference is the line around the edge.
  • Question 9

Look at this circle.

The radius is 5 units long.

How long is the diameter?

(Just write the number.)

 

Radius and diameter

CORRECT ANSWER
10
EDDIE SAYS
The diameter is double the length of the radius, so 5 x 2 = 10.
  • Question 10

Look at this circle.

The diameter is 22 units long.

How long is the radius?

(Just write the number.)

 

Radius and diameter

CORRECT ANSWER
11
EDDIE SAYS
The radius is half the length of the diameter, so 22 divided by 2 is 11.
---- OR ----

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