Răspuns :
m=meri;
p=peri;
m+p=360
m=p+12
acum inlocuim in relatia m+p=360
p+p+12=360
2p=360-12
2p=348
p=174
deci m=360-174
m=186
p= peri
m= meri
p+m= 360
m=p+12 => p+p+12= 360
p=(360-12):2
p=348:2
p=174
m=174+12
m=186
Probă: 186+174=360
m= meri
p+m= 360
m=p+12 => p+p+12= 360
p=(360-12):2
p=348:2
p=174
m=174+12
m=186
Probă: 186+174=360