|_____|_____|_____|_____|
M N P Q R
MN=3 cm
PR=6 cm
a )
daca P mijlocul seg MR => MP=PR
QR=3 cm
PR=6cm
PR = PQ + QR
6= PQ + 3
PQ = 6-3=3 cm
PR = MP = 6 cm
MP=MN + NP
6 = 3 + NP
NP = 6 -3
NP= 3 CM
NR=NP + PQ + QR
NR=3+3+3
NR = 9 cm