Lungimea=2×Latimea
Notam
-Lungimea = L8
-latimea = l
=> L=2×l
Suma tuturor lungimilor inseamna (2×L)+(2×l) =24
Inlocuim, in lungime,
(2×2×l)+(2×l)=24
=> 4×l+2×l=24
Rezulta ca 6×l=24
l ( latimea ) = 24/6 = 4 cm
L ( lungimea ) = 2× l= 4×2=8 cm
Verificam= 2×L+2×l= 2×8+2×4= 16 + 8= 24.