Find Areas of Circles Using Their Radiuses

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

Key stage:  KS 3

Curriculum topic:   Geometry and Measures

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

Difficulty level:

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.

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.

• Question 1

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

Just write the number to 1 decimal place.

314.2
EDDIE SAYS

Area = π x r2

Area = π x 102

• Question 2

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

Just write the number to 1 decimal place.

12.6
EDDIE SAYS

Area = π x r2

Area = π x 22

• Question 3

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

Just write the number to 1 decimal place.

78.5
EDDIE SAYS

Area = π x r2

Area = π x 52

• Question 4

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

Just write the number to 1 decimal place.

113.1
EDDIE SAYS

Area = π x r2

Area = π x 62

• Question 5

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

Just write the number to 1 decimal place.

804.2
EDDIE SAYS

Area = π x r2

Area = π x 162

• Question 6

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

Just write the number to 1 decimal place.

1963.5
EDDIE SAYS

Area = π x r2

Area = π x 252

• Question 7

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

Just write the number to 1 decimal place.

105.7
EDDIE SAYS

Area = π x r2

Area = π x 5.82

• Question 8

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

Just write the number to 1 decimal place.

483.1
EDDIE SAYS

Area = π x r2

Area = π x 12.42

• Question 9

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

Just write the number to 1 decimal place.

0.8
EDDIE SAYS

Area = π x r2

Area = π x 0.52

• Question 10

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

Just write the number to 1 decimal place.

50.0
EDDIE SAYS

Area = π x r2

Area = π x 3.992

---- OR ----

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