rearrange A = 2 pi r (r+h) to make h the subject

Question

(cylinder)

Answer 1

A = 2 pi r (r+h)
A = 2π r^2 + 2πrh
A - 2πr^2 = 2πrh
h = (A - 2πr^2)/(2πr)

Answer 2

S=2pir(r+h)