Răspuns:
Aflu semiperimetrul 298:2=149
L /------/------/------/ } 149
l /---/7.
adun 7 si obtin suma a 4 segmente egale
149+7=156
156:4=39 ( 1 segment)
l=39-7=32
L=3*39=117
sau
P=2(L+l)=298cm
L+l=298:2=149 cm
L=3l+21 din l=L:3-7 l+7=L/3 (l+7)*3=L inlocuim in ecuatia de sus si obtinem:
3l+21+l=149cm
4l=149-21=128cm
l=128:4=32 cm
L=149-32=117 cm
succes!
