Question

S=2×πrh, solve for r. I got S/2xh=r is that right?​

Answer 1

$given \: that \: s = 2 \times \pi \times r \times h$

by making r the subject, you need to divide the whole equation by 2πh

s/2πh = 2πhr/2πh

cancel out

r = s/2πh