M-mijloc[AB]⇒AB=2·AM=10cm⇒[AM]=[MB]=5cm
Daca MC=11cm,iar MB=5cm⇒BC=MC-MB⇒BC=11-5⇒BC=6cm
AC=AM+MC⇒AC=5+11⇒AC=16cm
P-mijloc[AC]⇒AP=PC=16\2=8cm⇒MP=AP-AM⇒MP=8-5⇒MP=3cm
N-mijloc[BC]⇒BN=BC\2⇒BN=6\2⇒BN=3cm
PB=MB-MP⇒PB=5-3⇒PB=2cm
NP=BN+PB⇒NP=3+2⇒PN=5cm