Question 626939
1) {{{Diagonal = sqrt(Length^2 + Width^2)=sqrt(24^2+35^2)=42.44}}}{{{ cm}}}


2) Diagonal of the square of side {{{a}}} is {{{a*sqrt(2)}}}. 
If the diagonal of the square is {{{16*sqrt(2)}}} then {{{a=16}}}. 
Hence, area of the square is {{{16^2 = 256}}}{{{cm^2}}}.


3) Use Pythagoras theorem again, the longer side is 28 cm.