a)AB=AE=20 m => BE=20rad2 m ; Aria ABE=200 m^2
BE=BC=20rad2 m => CE=40 m ; Aria EBC=1600 m^2
CE=CD=40m => DE=40rad2 m ; Aria ECD=800 m^2
=> Aria intregului teren =2600 m^2
b) Perim.teren = 20+20+40+40rad2+20 = 100+40rad2 m
c)
CF=FD=20 => AE=FD => AEDF paralelogram