Question 1174944
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Hi,
 *[illustration cylinder_2.jpg].
Side Surface = 2π radius x height
S = {{{2pi*rh + 2pi*r^2}}}
  r = (2x+1)
  h = 6(2x+1)
Side Surface = 12π (2x+1)^2
S = {{{12pi (2x+1)^2 + 2pi*(2x+1)^2 = 14pi(2x+1)^2}}}