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Find Areas of Circles Using Their Radiuses

In this worksheet, students find the areas of circles given their radiuses.

'Find Areas of Circles Using Their Radiuses' worksheet

Key stage:  KS 3

Curriculum topic:  Geometry and Measures

Curriculum subtopic:  Solve Problems Involving Perimeters and Areas of 2D Shapes

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

This worksheet is about finding the areas of circles.

 

You must learn this important formula for a circle of radius, r :

Area of a circle = π r2

 

 

Example

Find the area of a circle of radius 6 cm.

 

Answer

Area = π r2 =  π × 62 = π × 36 = 113.1 cm2  (1 dp)

Find the area of a circle of radius 10 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 2 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 5 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 6 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 16 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 25 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 5.8 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 12.4 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 0.5 cm in cm2.

Just write the number to 1 decimal place.

Find the area of a circle of radius 3.99 cm in cm2.

Just write the number to 1 decimal place.

  • ANSWERS
  • Question 1

Find the area of a circle of radius 10 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
314.2
EDDIE SAYS

Area = π x r2

Area = π x 102

  • ANSWERS
  • Question 2

Find the area of a circle of radius 2 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
12.6
EDDIE SAYS

Area = π x r2

Area = π x 22

  • ANSWERS
  • Question 3

Find the area of a circle of radius 5 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
78.5
EDDIE SAYS

Area = π x r2

Area = π x 52

  • ANSWERS
  • Question 4

Find the area of a circle of radius 6 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
113.1
EDDIE SAYS

Area = π x r2

Area = π x 62

  • ANSWERS
  • Question 5

Find the area of a circle of radius 16 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
804.2
EDDIE SAYS

Area = π x r2

Area = π x 162

  • ANSWERS
  • Question 6

Find the area of a circle of radius 25 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
1963.5
EDDIE SAYS

Area = π x r2

Area = π x 252

  • ANSWERS
  • Question 7

Find the area of a circle of radius 5.8 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
105.7
EDDIE SAYS

Area = π x r2

Area = π x 5.82

  • ANSWERS
  • Question 8

Find the area of a circle of radius 12.4 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
483.1
EDDIE SAYS

Area = π x r2

Area = π x 12.42

  • ANSWERS
  • Question 9

Find the area of a circle of radius 0.5 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
0.8
EDDIE SAYS

Area = π x r2

Area = π x 0.52

  • ANSWERS
  • Question 10

Find the area of a circle of radius 3.99 cm in cm2.

Just write the number to 1 decimal place.

CORRECT ANSWER
50.0
EDDIE SAYS

Area = π x r2

Area = π x 3.992

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