Answer
$c=\dfrac{2Lw}{\theta}$
Work Step by Step
Using the properties of equality, in terms of $
c
,$ the given equation, $
\dfrac{\theta}{w}=\dfrac{2L}{c}
,$ is equivalent to
\begin{array}{l}
\theta c=2Lw
\\\\
c=\dfrac{2Lw}{\theta}
.\end{array}