Question 916745
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
*[illustration cylinder].

S = {{{2pi*rh + 2pi*r^2}}}
S = {{{2*pi(2x)(x) + 2*pi(2x)^2 }}}
S = {{{4*pi*x^2 + 8*pi*x^2 }}}
S = {{{12*pi*x^2  }}}
S = {{{12*3.14x^2  }}}