ABCD- dreptunghi l=20cm , L=2×l P=? Află: L=? P=?

1.L=2l L=40 cm
P=2L+2l =2×20+2×40=120 cm
2.l1=14 l2=20 l3=33
P=l1+l2+l3 = 14 +20 +33 =69 cm