a-lungimea primei lature
b-lungimea celei de a doua
c-lungimea celei de a treia
d-lungimea celeri de a patra latura
a+b+c+d=181
a/4=b-29=c/2=d
Mai intai ne folosim de relatia :c/2=d
Si inlocuim in prima: a+b+c+c/2=181
a+b+3c/2=181
Apoi ne folosim de relatia :b-29=c/2 =>b=c/2+29
Inlocuim :a+c/2+29+3c/2=181
a+5c/2=152
Acum ne folsim de relatia :a/4=c/2 =>a=(c/2)*4
Inlocuim :4c/2+5c/2=152
9c/2=152
9c=304
c=304/9
Deci a=(304/9/2)*4
a=608/9
b=154/9+29
b=415/9
d=154/9
