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Ubuntuuber · Answer 1 · 2016-01-08T02:01:05+0000

The circumference of a circle is proportional to its diameter.

$C\propto d\\ \\ \therefore \quad C=kd$

Now, when d=1, C=π, therefore:

k=π

This means that:

$C=\pi d$

If C=15π:

15π=πd

Therefore:

d=15

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