Step-by-step explanation:
s = 2pirh
s ÷ 2 = pirh
s ÷ 2pi = rh
s ÷ 2pih = r
You just need to divide both sides by [tex]2\pi h[/tex]: the equation becomes
[tex]s = 2\pi rh \iff \dfrac{s}{2\pi h}=\dfrac{2\pi rh}{2 \pi h} \iff \dfrac{s}{2\pi h}=r[/tex]
