Question 1088929
h, how high the water in the tank, in meters


{{{4*6*h=36}}}
{{{h=36/(4*6)}}}
{{{h=(6*6)/(4*6)}}}
{{{h=3/2}}}


The total area inside the tank touching water:
{{{4*(3/2)*2+6*(3/2)*2+4*6}}}

{{{6*2+6*3+24}}}
{{{12+18+24}}}
{{{highlight(54*m^2)}}}