Question

The circumference of the ferris wheel at the county fair is 78.5 feet. what is the diameter in feet? Round to the nearest hundredth

Answer 1

$\bf \textit{circumference of a circle}\\\\ C=2\pi r\qquad \begin{cases} diameter=d\\ r=radius=\frac{d}{2}\\ ----------\\ C=78.5\\ \end{cases} \\\\\\ 78.5=2\pi r\implies 78.5=2\pi \cdot \cfrac{d}{2}$

solve for "d"