# If a pipe is 2 inches diameter what is the circumference?

circumference is $2 \pi$
The circumference ($C$) of a circle based on the Diameter ($D$) is given by the equation
$\textcolor{w h i t e}{\text{XXX}} C = \pi D$
$\textcolor{w h i t e}{\text{XXX}}$ where $\pi$ is the standard constant ($\approx 3.14159$)