Question 929693
x inches square edge is cut to make each flap.

The height then will be x.



{{{(12-2x)(12-2x)=64}}}, the base area.
{{{2*2(6-x)(6-x)=64}}}
{{{(6-x)(6-x)=16}}}
{{{6-x=sqrt(16)=4}}}
{{{highlight(x=2)}}}