Question 333023
The length of one side is {{{L = 1 + sqrt(2)}}}
The area of a square is given by the {{{L^2}}}
{{{Area = (1+sqrt(2))^2}}}
{{{Area = (1+sqrt(2))(1+sqrt(2))}}}
{{{Area = 1*1 + 1*sqrt(2) + sqrt(2)*1 + (sqrt(2))^2 }}}
{{{Area = 1 + 2*sqrt(2) + 2}}}
{{{Area = 3 + 2*sqrt(2)}}}

http://www.wolframalpha.com/input/?i=%281%2Bsqrt%282%29%29^2