# Suppose the circumference of a circle is 9pi. What is its diameter?

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Mar 29, 2016

The diameter is $9$

#### Explanation:

The circumference of a circle is $S = \pi \cdot d$ where d is the diameter hence

$S = \pi \cdot d \implies 9 \cdot \pi = \pi \cdot d \implies d = 9$

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