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Find Circumferences of Circles Using Their Radii (1)

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

'Find Circumferences of Circles Using Their Radii (1)' worksheet

Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

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

Difficulty level:  

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 radius 25 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 5 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 7 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 10 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of radius 3.5 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 4 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 10 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 14 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 12 cm.

(Just write the number to 1 decimal place)

Find the circumference of a circle of diameter 42 cm.

(Just write the number to 1 decimal place)

  • Question 1

Find the circumference of a circle of radius 25 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
157.1
EDDIE SAYS
2 × π × 25
  • Question 2

Find the circumference of a circle of radius 5 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
31.4
EDDIE SAYS
2 × π × 5
  • Question 3

Find the circumference of a circle of radius 7 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
44.0
EDDIE SAYS
2 × π × 7
  • Question 4

Find the circumference of a circle of radius 10 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
62.8
EDDIE SAYS
2 × π × 10
  • Question 5

Find the circumference of a circle of radius 3.5 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
22.0
EDDIE SAYS
2 × π × 3.5
  • Question 6

Find the circumference of a circle of diameter 4 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
12.6
EDDIE SAYS
π × 4
  • Question 7

Find the circumference of a circle of diameter 10 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
31.4
EDDIE SAYS
π × 10
  • Question 8

Find the circumference of a circle of diameter 14 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
44.0
EDDIE SAYS
π × 14
  • Question 9

Find the circumference of a circle of diameter 12 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
37.7
EDDIE SAYS
π × 12
  • Question 10

Find the circumference of a circle of diameter 42 cm.

(Just write the number to 1 decimal place)

CORRECT ANSWER
131.9
EDDIE SAYS
π × 42
---- OR ----

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