Circumference from Radius (Level 1)

This math topic involves computing the circumference of a circle using the radius provided in each question, emphasizing mental calculation by approximating π as slightly more than 3. The problems are designed to enhance understanding of the relationship between a circle's radius and its circumference within the broader context of introductory geometry focused on circle measurements. Each exercise offers multiple-choice answers, encouraging practice in accurate arithmetic operations and estimation involving π. This set of exercises is part of a foundational unit in geometric principles concerning circular shapes.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

Circumference from Radius Worksheet

Math worksheet on 'Circumference from Radius (Level 1)'. Part of a broader unit on 'Geometry - Circle Circumference - Intro' Learn online: app.mobius.academy/math/units/geometry_circles_perimeter_intro/

1

Find the circumference without using a calculator. Remember that π is just a bit more than 3.

a

78.54

b

10

c

50.27

d

43.98

e

15.71

f

31.42

2

Find the circumference without using a calculator. Remember that π is just a bit more than 3.

a

12.57

b

6.28

c

4

d

8

e

37.7

f

18.85

3

Find the circumference without using a calculator. Remember that π is just a bit more than 3.

a

31.42

b

15.71

c

10

d

37.7

e

43.98

f

78.54

4

Find the circumference without using a calculator. Remember that π is just a bit more than 3.

a

25.13

b

50.27

c

8

d

31.42

e

12.57

f

32

5

Find the circumference without using a calculator. Remember that π is just a bit more than 3.

a

6.28

b

4

c

18.85

d

12.57

e

8

f

25.13

6

Find the circumference without using a calculator. Remember that π is just a bit more than 3.

a

9.42

b

31.42

c

28.27

d

18

e

18.85

f

6

7

Find the circumference without using a calculator. Remember that π is just a bit more than 3.

a

2

b

25.13

c

31.42

d

6.28

e

12.57

f

3.14