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Circumference - Equation to Radius

Level 1

This math topic helps students practice finding the radius of a circle when provided with the circle's circumference. It involves direct application of the circumference formula \(C = 2\pi r\), requiring students to rearrange the formula to solve for the radius \(r\). The problems contain given values of the circumference, and students must select the correct radius from multiple choices. These tasks are designed to reinforce students' understanding of basic circle geometry and arithmetic skills.

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

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Circumference - Equation to Radius

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

Given this equation for the circumference, what is the radius of this circle

C=2⋅π⋅10C = 2 \cdot \pi \cdot 10

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Circumference - Equation to Radius Worksheet

Mobius Math Club logo
Math worksheet on 'Circumference - Equation to 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
Given this equation for the circumference, what is the radius of this circle
A LaTex expression showing C = 2 times Pi times 13
a
r = 11
b
r = 14
c
r = 13
d
r = 15
e
r = 12
f
r = 10
2
Given this equation for the circumference, what is the radius of this circle
A LaTex expression showing C = 2 times Pi times 12
a
r = 11
b
r = 12
c
r = 8
d
r = 15
e
r = 14
f
r = 7
3
Given this equation for the circumference, what is the radius of this circle
A LaTex expression showing C = 2 times Pi times 3
a
r = 3
b
r = 7
c
r = 4
d
r = 2
e
r = 0
f
r = 1
4
Given this equation for the circumference, what is the radius of this circle
A LaTex expression showing C = 2 times Pi times 7
a
r = 2
b
r = 4
c
r = 6
d
r = 10
e
r = 7
f
r = 5
5
Given this equation for the circumference, what is the radius of this circle
A LaTex expression showing C = 2 times Pi times 4
a
r = 4
b
r = 1
c
r = 8
d
r = 5
e
r = 6
f
r = 0
6
Given this equation for the circumference, what is the radius of this circle
A LaTex expression showing C = 2 times Pi times 6
a
r = 6
b
r = 10
c
r = 4
d
r = 7
e
r = 2
f
r = 1
7
Given this equation for the circumference, what is the radius of this circle
A LaTex expression showing C = 2 times Pi times 2
a
r = 4
b
r = 5
c
r = 0
d
r = 1
e
r = 3
f
r = 2