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The formula for the circumference of a circle is C = 2r. What is one-fourth of the circumference of a circle that measures 12 centimeters around? If necessary, use 3.14 for .

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The formula of a circumference is:

[tex]C=2\pi r[/tex]

r - radius

or

[tex]C=d\pi[/tex]

d - diameter

We have d = 12cm. Substitute:

[tex]C=12\pi\ cm[/tex]

One-fourth of the circumference:

[tex]\dfrac{1}{4}C=\dfrac{1}{4}\cdot12\pi=3\pi\ cm\approx3\cdot3.14=9.42\ cm[/tex]

Answer:  9.42 cm.

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