Question 1174943
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Hi,
 *[illustration cylinder_2.jpg].
Side Surface = 2π(radius x height)
S = {{{2pi*rh + 2pi*r^2}}}
  r = (3x+1)
  h = 3(2x+1)
Side Surface =6π(3x+1)^2
S = {{{6pi(3x+1)^2 + 2pi*(3x+1)^2 = 8pi(3x+1)^2}}}