Question 604201
I assume you mean the volume of a rectangular box. 
The formula for the volume of a rectangular shaped box is 
{{{Volume = Length* Width* Height}}}
You are told the dimension of the base (the length and width) are both 13 ft. The volume is given as 234 cubic Ft. So

{{{234 = 13 * 13 * Height}}}
{{{234/(13*13) = Height}}}
{{{234/169 = Height}}}
{{{1.385 = Height}}} in feet