Răspuns:
AE ⊥DC ; AE = AD/2 = 4/2 =2cm ; cateta care se opune la unghide 30°=ipotenuza 2 ; b) A =B.H= 8.2=16cm² ; c) ΔMAB asemenea ΔAND ;∠NDA=∠DCB=∠ABM ;corespondente ; ∠MAB= ∠AND corespondente ; MB/AD=AB/ND ; MB.ND= AB.AD= 8.4 =32
