Question 851145
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Hi,
cylinder tank is <u>horizontal</u>
Cylinder: h = 540cm, r = 120cm, 
{{{V[2cm] = A[2cm]*L = 58.2775*540 cm^3}}}   where  {{{A[2cm]=r^2cos^(-1)((r-d) /r) - (r-d)sqrt(2rd - d^2)=highlight(58.2775)}}} d = 2cm
{{{V[3cm] = A[3cm]*L = 106.9279*540 cm^3}}}   where  {{{A[3cm]=r^2cos^(-1)((r-d) /r) - (r-d)sqrt(2rd - d^2)= highlight(106.9279)}}}  d = 3cm
A number of online calculators to compute A.  Might recommend:
http://www.mathopenref.com/segmentareaht.html