Răspuns:
1. A= lxl a) A= 7x7=49 [tex]m^{2}[/tex] b) A=27x27=729 [tex]cm^{2}[/tex] = 0,0729 [tex]m^{2}[/tex]
c) A= 30x30=900 [tex]dam^{2}[/tex] = 9000 [tex]m^{2}[/tex]
2. P=4*l l= P:4 =156:4=39 m latura=39 m
3. A=L*l => l= A:L = 864:27=32m
P=2l+2L= 2*32+2*27=64+54=118 m
4. P=4l => l= 400:4=100
A=100*100=10000 [tex]m^{2}[/tex]
13*10000=130000 kg
130000* 4= 520000 lei
5. A=l*L= 5*8=40 [tex]m^{2}[/tex]
40*64=2560 lei
6. P=2l+2L l=L:2 => L=2l
P=2l+2*2l= 2l+4l= 6l
l= 354:6 = 59 m
L= 2*59=118 m
A= L*l= 118*59= 6962 [tex]m^{2}[/tex]
7. P1=4l => l=496:4 =124 m latura patrat =124 m
A1= l*l= 124 *124= 15376 [tex]m^{2}[/tex] ( aria patrat)
34 876 - 15376 =19500 [tex]m^{2}[/tex] (aria dreptunghi)
A= l*L => L=19500:130 =150 m
L=150m
