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 = (4*Ax)/5
As they are similar: By = (4*Ay)/5
Area of A = Ax*Bx
Area of B = Ay*By = (16*Ax*Ay)/25
Area of B 16
----------- = -------
Area of A 25
