Răspunsuri

2014-10-09T17:03:10+03:00
Perimetrul paralelogramului=L*2+l*2
68cm=18*2+l*2
68cm=36+l*2
l*2=32 cm
l=16 cm
Cel mai inteligent răspuns!
2014-10-09T17:18:05+03:00
ABCD-paralelogram
AB=CD
BC=AD
Fie AB=18 cm⇒CD=18 CM
AB+CD+BC+AD=68
18+18+BC+AD=68
36+BC+AD=68
Dar BC=AD.⇒2BC=68-36
2BC=32
BC=32:2
BC=16⇒AD=16 CM