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Circumference - Radius and Pi Definition to Equation (Decimals) (Level 1)

This math topic focuses on calculating the circumference of circles using the formula C = 2πr, where C represents circumference and r is the radius. The problems involve inserting given radius values (which are decimals or whole numbers) into the formula, with π approximated as 3.14. By correctly substituting the radius into the equation, students practice using the circumference formula in a straightforward application to enhance their understanding of circle geometry at an introductory level. Each problem presents multiple-choice answers, encouraging learners to perform correct arithmetic operations and select the accurate result.

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

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Circumference - Radius and Pi Definition to Equation (Decimals)

Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.


Given this information, what is the circumference of this circle

C=2πrradius=12C = 2 \cdot \pi \cdot r\\\\radius = 12

Circumference - Radius and Pi Definition to Equation (Decimals) Worksheet

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Math worksheet on 'Circumference - Radius and Pi Definition to Equation (Decimals) (Level 1)'. Part of a broader unit on 'Geometry - Circle Circumference - Intro' Learn online: app.mobius.academy/math/units/geometry_circles_perimeter_intro/
1
Given this information, what is the circumference of this circle
A LaTex expression showing C = 2 times Pi times r\\\\radius = 3
a A LaTex expression showing C = 3.14 times 7 to the power of 2
b A LaTex expression showing C = 3.14 times 1 to the power of 2
c A LaTex expression showing C = 3.14 times 3
d A LaTex expression showing C = 3.14 times 2 to the power of 2
e A LaTex expression showing C = 2 times 3.14 times 3
f A LaTex expression showing C = 3.14 over 2
2
Given this information, what is the circumference of this circle
A LaTex expression showing C = 2 times Pi times r\\\\radius = 8
a A LaTex expression showing C = 3.14 times 6 to the power of 2
b A LaTex expression showing C = 3.14 times 4
c A LaTex expression showing C = 3.14 times 9
d A LaTex expression showing C = 3.14 over 4
e A LaTex expression showing C = 3.14 over 8
f A LaTex expression showing C = 2 times 3.14 times 8
3
Given this information, what is the circumference of this circle
A LaTex expression showing C = 2 times Pi times r\\\\radius = 5
a A LaTex expression showing C = 3.14 times 3
b A LaTex expression showing C = 3.14 over 6
c A LaTex expression showing C = 2 times 3.14 times 5
d A LaTex expression showing C = 3.14 times 2
e A LaTex expression showing C = 3.14 over 5
f A LaTex expression showing C = 3.14 times 5
4
Given this information, what is the circumference of this circle
A LaTex expression showing C = 2 times Pi times r\\\\radius = 12
a A LaTex expression showing C = 3.14 over 12
b A LaTex expression showing C = 2 times 3.14 times 12
c A LaTex expression showing C = 3.14 times 12 to the power of 2
d A LaTex expression showing C = 3.14 times 16 to the power of 2
e A LaTex expression showing C = 3.14 times 7 to the power of 2
f A LaTex expression showing C = 3.14 times 10
5
Given this information, what is the circumference of this circle
A LaTex expression showing C = 2 times Pi times r\\\\radius = 2
a A LaTex expression showing C = 3.14 over 2
b A LaTex expression showing C = 3.14 over 1
c A LaTex expression showing C = 3.14 times 5
d A LaTex expression showing C = 3.14 times 2 to the power of 2
e A LaTex expression showing C = 2 times 3.14 times 2
f A LaTex expression showing C = 3.14 times 1 to the power of 2
6
Given this information, what is the circumference of this circle
A LaTex expression showing C = 2 times Pi times r\\\\radius = 7
a A LaTex expression showing C = 3.14 times (5 over 2 ) to the power of 2
b A LaTex expression showing C = 2 times 3.14 times 7
c A LaTex expression showing C = 3.14 times 4
d A LaTex expression showing C = 3.14 times 3 to the power of 2
e A LaTex expression showing C = 3.14 times 7
f A LaTex expression showing C = 3.14 times 7 to the power of 2
7
Given this information, what is the circumference of this circle
A LaTex expression showing C = 2 times Pi times r\\\\radius = 9
a A LaTex expression showing C = 2 times 3.14 times 9
b A LaTex expression showing C = 3.14 times 9 to the power of 2
c A LaTex expression showing C = 3.14 over 11
d A LaTex expression showing C = 3.14 times 4 to the power of 2
e A LaTex expression showing C = 3.14 times 5
f A LaTex expression showing C = 3.14 times 9