Question

O gradina in forma de dreptunghi are latimea 2\3 din lungime si perimetru 12 dam. Aflati aria gradinii in ari.

Answer 1

$L= \frac{2l}{3} \\ P=l+l+L+L \\ 120m= \frac{2l}{3} + \frac{2l}{3} +l+l \\ 2l+2l+3l+3l=120m \\ 10l=120m \\ l=12m \\ L=48cm$

Answer 2

A=L*l
l=2/3L
P=2(L+l)
P=12 dam
12=2(L+2/3L)
12=2*5/3L
L=12*3/10
L=36/10=3,6 dam
l=2/3*36/10
l=12/5=2,4 dam
A=3,6*2,4
A=8,64 dam²(ari)
1 dam²=1 ar