Question 846130
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Hi,
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r=9
L=?
SA=622.04
SA= {{{pi(r^2+ rL)}}}  Using {{{pi = 3.14}}}
{{{622.04/3.14 =9^2 + 9L}}}
  (198.1 - 81)/9 = L = 13.0113
CHECKING our answer***
SA= {{{pi*r^2+pi*rL}}} = {{{3.14*81 + 3.14*9*13.0113 =  622.04}}}
Wish You the Best in your Studies.