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

User Nathan BeDell
by
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1 Answer

1 vote
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
User Ubuntuuber
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