1) FIE TRAPEZUL ABCD, ABPARALELE CU CD, AB>CD. DUCEM INALTIMEA CM= >TR DREPTUNGHIC BMC=> CONF TH PITAGORA CM PATRAT=BC PATRAT-BM PATRAT=169-144=25=>CM=5 (INALTIMEA TRAPEZ) 3)UNGH ASCUTIT AL PARALELOGR ARE 30 GRADE. DUCEM INALTIME SI OBTINEM UN TR DREPTUNGHIC CUUN UNGH DE 30 GRADE=>CONF TH UNGH 30 GRADE H=6/2=3=> ARIA =B*H=8*3=24. 4) A=D1*D2/2=96=>D1*D2=192; D1/D2=3/4=>D1=3D2/4, INLOCUIM SI =>3D2/4*D2=192=>D2 PATRAT=192*4/3=>D2=16=>D1=12=> L ROMB PATRAT=36+64=100=> LAT ROMB=10. ARIA =B*H=>96=10*H=>H=96/10=9,6=> RAZA CERC=4,8