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Find Circumferences of Circles Using Their Radii (2)

In this worksheet, students use formulae to calculate the circumferences of circles given their radii.

'Find Circumferences of Circles Using Their Radii (2)' worksheet

Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   2D Shapes: Circles, Angles and Bearings

Difficulty level:  

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Worksheet Overview

QUESTION 1 of 10

This worksheet is about finding the circumferences of circles.

The circumference of a circle is its perimeter or the distance around its edge.

 

You must learn these two important formulae for a circle of radius, r or diameter, d:

Circumference of a circle = 2πr

Circumference of a circle = πd

 

 

 

Example 1

Find the circumference of a circle of radius 6 cm.

 

Answer

Circumference = 2 × π × r = 2 × π × 6 = 12 × π = 37.7 cm  (1 dp)

 

 

Example 2

Find the circumference of a circle of diameter 6 cm.

 

Answer

Circumference = π × d = π × 6 = 18.8 cm  (1 dp)

Find the circumference of a circle of diameter 15.5 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 12 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 5.8 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 2.5 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 5.99 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 4.5 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 15.9 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 35 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 0.7 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 11.1 cm.

(Just write the number to 1 decimal place)

  • Question 1

Find the circumference of a circle of diameter 15.5 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
48.7
EDDIE SAYS
π × 15.5
  • Question 2

Find the circumference of a circle of radius 12 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
75.4
EDDIE SAYS
2 × π × 12
  • Question 3

Find the circumference of a circle of diameter 5.8 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
18.2
EDDIE SAYS
π × 5.8
  • Question 4

Find the circumference of a circle of radius 2.5 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
15.7
EDDIE SAYS
2 × π × 2.5
  • Question 5

Find the circumference of a circle of radius 5.99 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
37.6
EDDIE SAYS
2 × π × 5.99
  • Question 6

Find the circumference of a circle of diameter 4.5 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
14.1
EDDIE SAYS
π × 4.5
  • Question 7

Find the circumference of a circle of diameter 15.9 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
50.0
EDDIE SAYS
π × 15.9
  • Question 8

Find the circumference of a circle of radius 35 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
219.9
EDDIE SAYS
2 × π × 35
  • Question 9

Find the circumference of a circle of radius 0.7 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
4.4
EDDIE SAYS
2 × π × 0.7
  • Question 10

Find the circumference of a circle of radius 11.1 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
69.7
EDDIE SAYS
2 × π × 11.1
---- OR ----

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