Karlie1998 Karlie1998

23-08-2015
Mathematics

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Suppose the circumference of a circle is 15pi. What is its diameter?

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Аноним Аноним

23-08-2015

The circumference of a circle is proportional to its diameter.

[tex]C\propto d\\ \\ \therefore \quad C=kd[/tex]

Now, when d=1, C=π, therefore:

k=π

This means that:

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

If C=15π:

15π=πd

Therefore:

d=15

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