Question 204918
diagonal of a square with the side x is {{{x*sqrt(2)}}}
{{{x*sqrt(2)=42.5}}}
{{{x=42.5/sqrt(2)}}}


perimeter = 4x 
= {{{4*42.5/sqrt(2) = 170/sqrt(2)}}}
= {{{(170/sqrt(2))*(sqrt(2)/sqrt(2))}}}
= {{{(170*sqrt(2))/2}}}
= {{{85*sqrt(2) cm}}}


area = {{{x^2}}}
= {{{(42.5/sqrt(2))^2}}}
= {{{1806.25/2}}}
= 903.125 cm^2