Question

o gradina in forma de dreptunghi are perimetrul de 140m. stiind ca lungimea gradinii este 50m,afla latimea acesteia.

Answer 1

L-lungimea
l-latimea
P-perimetru

P.dreptunghi=2×(L+l)

P=140, L=50⇒

140=2×(50+l)⇒140:2=50+l⇒70=50+l⇒l=70-50⇒l=20

Answer 2

P=2×( L×l)
L=50.
l=?
P=140m
2×(L×l)=140m
2×(50+l)=140
100+2l=140
2l=140-100
2l=40
l=40÷2
l=20m
Latime gradinii este de 20m.