How to find the length of a cylinder when u have volume and circumference

Circumfernce=2pir

Vcylinder=lpir^2

so what you do is take circumference adnd solvefor r, then input that for r in Volume and solve for legnth

C=2pir

C / (2pi) = r

input

V=lpir^2

V=lpi (C/2pi) ^2

V=lpi (c^2 / (4pi^2))

V=l (c^2/4pi)

multiply both sides by (4pi) / (c^2) to clear fractio

(4piV) / (C^2) = legnth

basically if you know volume and circumference

legnth = (4pi tmes volume) / (circumference^2)