Make an auxiliary line BH parallel to DE through B and cross AD at H..

Connect AC and cross BH at point M.

Let BF and DE be given to point n

Then am = cn, Mn: cn = 2: 1.

Therefore, cn: na = 1: 3.

The diagonal ratio of s 1 and s2 is 1:3, and the side length ratio is 1:3.

The area ratio is 1:9.