AB = 9 (lungime)
BC = 6 (latime)
P = 2(lungime + latime ) = 2*15 = 30
AM = MN = NB = AB/3 = 3
BP = PC = BC/2 = 3
Aria AMD =DA*AM/2 = 6*3/2 =9
Aria NBP = NB*BP/2 = 3*3/2=9/2 = 4.5
Aria DCP = DC*CP/2 = 9*3/2 = 27/2 = 13.5
Arie hasurata e egala cu suma acelor triunghiuri = 9+4.5+13.5 = 27 m patrati
Aria DAN = DA*(AM+MN)/2 = 6*6/2 = 18
Aria NBCD = Aria dreptungiului - Aria DAN = 9*6 - 18 = 54-18 = 36
18 = 36/2 => Adevarat
