Question 1014358
Assume the side is s.
Then using the Pythagorean theorem,
{{{s^2+s^2=d^2}}}
{{{d^2=2s^2}}}
{{{d=sqrt(2)*s}}}
From the area,
{{{A=s^2}}}
{{{s=sqrt(A)}}}
So in this case,
{{{d=sqrt(2)*sqrt(450)}}}
{{{d=sqrt(900)}}}
{{{d=30}}}{{{m}}}