Răspuns :
Aria dreptunghi: L×l
Aria EDF: (L/2×l/2) /2= L×l/8
Aria FCB: (L/2×l) /2=L×l/4
Aria EAB: (L×l/2) /2= L×l/4
Aria BEF: Aria dreptunghi - aria EDF- aria FCB- aria EAB= L×l- L×l/8 - L×l/4 - L×l/4= 3/8L×l
aria BEF/ aria dreptunghi =((3L×l)/8)/ L×l = 3/8