Question 811316
Let {{{ e }}} = length of it's edge
{{{ e^2 }}} = surface area of one side
{{{ 6*e^2 }}} = surface area of the cube
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{{{ 54 = 6*e^2 }}}
{{{ e^2 = 9 }}}
{{{ e = 3 }}}
The edge is 3 units long