Question

1.Calculati aria unui dreptunghi care are lungimea de 7 m si perimetrul de 22 m.  2.Stiind ca aria unui patrat este de 0,36 m patrati ,calculati perimetrul acestuia.

Answer 1

1)P= 22m
P= 2l+2L
22=2l+2*7
22=2l+14
2l=22-14
2l=8
l=4
2) A patrat=l patrata
radical 36=l
l=6
P=4l
P=4*6=24

Answer 2

x-imnultit
1.
P=2l+2L
22m=2l+2x7m
22m=2l+14m
2l=22m-14m
2l=8m
l=8m:2
l=4m
L=7m
l=4m
A=Lxl
A=7mx4m
A=28$m^{2}$

2.
0,36$m^{2}$=36$cm^{2}$
A=$l^{2}$
36$cm^{2}$=$l^{2}$
l=6cm
P=l+l+l+l
P=4l
P=4x6cm
P=24cm