Exercitiul 3 va rogggg

AB-1CM
BC-2.5 CM
CD=1.5 CM
DE=2CM
EF=2.5CM
FG=1 CM
GH=0.5CM
HI=2.5 CM
IJ=0.5CM
le adunam pe toate
1+2.5+1.5+2+2.5+1+0.5+2.5+0.5=14cm are perimetrul