Răspuns :
P = 36m;
x -> latimea
x+4 -> lungimea
2(x+x+4)=36
x+x+4=36:2
2x+4=18
2x=18-4
2x=14
x=14:2=7
==> 7 - latimea; 7+4= 11 - lungimea.
Verificare: 2(7+11)= 2 * 18= 36
x -> latimea
x+4 -> lungimea
2(x+x+4)=36
x+x+4=36:2
2x+4=18
2x=18-4
2x=14
x=14:2=7
==> 7 - latimea; 7+4= 11 - lungimea.
Verificare: 2(7+11)= 2 * 18= 36