4)p=l+l+l
P=17+17+17=51 dam
5)P=279 m
P=3l
279 =3l
l=279:3
l=93 m
6)(27+28+29)x3=84x3=252 m
7)P=7435
Notam a, b, c laturile triunghiului
A+b+c=7435
A=1/5x7435
A=1487
B=2/5x7435=14870/5
B=2974
1487+2974+c=7435
C=7435-4461
C=2974
Verificare
1487+2974+2974=7435
4461+2974=7435
7435=7435
