Question 1080863
You can find the length of the diagonal in terms of the side using the Pythagorean theorem,
{{{s^2+s^2=D^2}}}
{{{2s^2=D^2}}}
Substituting,
{{{2s^2=(52)^2}}}
{{{2s^2=2704}}}
{{{s^2=1352}}}
{{{s=sqrt(1352)}}}
{{{s=26sqrt(2)}}}