Question

a circle has a radius of 9 cm. what is its circumference? use 3.14 for π, and do not round your answer. be sure to include the correct unit your answer.

Explanation:

Step1: Recall the formula for circumference

The formula for the circumference of a circle is \(C = 2\pi r\), where \(r\) is the radius.

Step2: Substitute the given values

Given \(r = 9\) cm and \(\pi=3.14\), substitute into the formula: \(C = 2\times3.14\times9\).
First, calculate \(2\times9 = 18\). Then, \(C=3.14\times18\).
\(3.14\times18=(3 + 0.14)\times18=3\times18+0.14\times18=54 + 2.52 = 56.52\).

Answer:

\(56.52\) cm