Let us call the frames A and B
The two sides of A are Ax and Ay
The two sides of B are Bx and By
Bx 4
---- = ----
Ax 5
Bx = (4Ax)/5
As they are similar: By = (4Ay)/5
Area of A = AxBx
Area of B = AyBy = (16AxAy)/25
Area of B 16
----------- = -------
Area of A 25
