Answer:
[tex]l = \frac{s - π {r}^{2} }{πr} [/tex]
Step-by-step explanation:
s = πrl + πr²
First move πr² to the left side of the equation
We have
πrl = s - πr²
Divide both sides by πr to make l stand alone
That's
[tex] \frac{\pi \:rl}{\pi \: r} = \frac{s - \pi \: {r}^{2} }{\pi \: r} [/tex]
We have the final answer as
[tex]l = \frac{s - π {r}^{2} }{πr} [/tex]
Hope this helps you
