Question 193341
draw  a  rough  sketch  of  rectangle(10XS)  and  a  square  (SXS)
note  Ar=2As
10s=2s^2
0=2s^2-10s
0=(2s)(s-5)
2s=s,  s=0,,,,,trivial  answer
s-5=0,,,,s=5

check
10*5=50=2*5^2=50  ,,,,ok