AM/MB = 1/3
MB = AB - AM
inlocuim
AM/(AB - AM) = 1/3
3AM = AB - AM
4AM = AB
AM = AB/4 = 24mm/4 = 6 mm
MN = AB - AM = 24mm - 6 mm = 18 mm
MN || BC
AM/MB = 1/3 } => AN/NC = 1/3
NC = AC - AN
inlocuim
AN/(AC - AN) = 1/3
3AN = AC - AN
4AN = AC
AN = AC/4 = 32mm/4 = 8 mm
CN = AC - AN = 32mm - 8mm = 24 mm