Equivalent formula for circumference of a circle.
Check the final answer first, then review the worked steps.
Problem
Equivalent formula for circumference of a circle.
Step-by-step solution
The circumference of a circle is given by $C = 2\pi r$. Since the diameter $d = 2r$, we can substitute $2r$ with $d$ in the formula to get $C = \pi d$.
Answer
$C = \pi d$