Question 661091
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Hi,
{{{T = 4sqrt(LH^2/25)}}}  T, in inches, and height H, in feet,
 {{{ T^2/16 = LH^2/25}}}
  {{{25T^2/16H^2}}} = L    |||pillar is in 4 inches thick and 10 feet high
  {{{25*16/(16*100)}}} = L