Respuesta :

S = 2Πrh + 2Πr2
Manipulating the equation for h.
Step 1. subtract 
2Πr2 on both sides.

S - 2Πr2 = 2Πrh + 2Πr2 - 2Πr2
S - 2Πr2 = 2Πrh

Step 2 . divide 2Πr on both sides

(S - 2Πr2)/2Πr = 2Πrh/2Πr

h = (S - 2Πr2)/2Πr