Question 426574
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Hi
 V(cylinder) = {{{pi*r^2h}}}   (sweeping the base up thru the height)
 d = 7'5" Or 89"  r = 44.5" OR 3.7083 ft
  V = 3.14 * 3.7^2*44ft  = 1891.4 ft^3, th evolume of marble in the column