[tex]A= \dfrac{r}{2l} [/tex] [tex]\text{Equation}[/tex]
[tex]A= \dfrac{rl}{2} [/tex] [tex]\text{Simplify Equation}[/tex]
[tex]A*2=rl
[/tex] [tex]\text{Multiply both sides by 2}[/tex]
[tex]2A=rl[/tex] [tex]\text{Regroup terms}[/tex]
[tex] \dfrac{2a}{r}=l [/tex] [tex]\text{Divide both sides by r}[/tex]
[tex]l=\dfrac{2a}{r}[/tex] [tex]\text{Solution}[/tex]
