[tex]\boxed{r=\frac{S}{2\pi h}}[/tex]
Remember you have two write complete questions in order to get good and exact answers. Here I'll assume you want to isolate the radius (r). So:
The formula for the lateral surface area of a cylinder is:
[tex]S=2\pi rh \\ \\ \\ Where: \\ \\ S:Lateral \ surface \ area: \\ \\ r:Radius \\ \\ h:Height[tex]
[tex]Dividing \ both \ sides \ by \ 2\pi h: \\ \\ S=2\pi rh \\ \\ \frac{S}{2\pi h}=\frac{2\pi rh}{2\pi h} \\ \\ \\ Finally: \\ \\ \boxed{r=\frac{S}{2\pi h}}[/tex]
Cylinder: https://brainly.com/question/12248187
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