As shown in the figure, C is any point on AB, M is the midpoint of AC, and N is the midpoint of BC. If AB = 10cm, calculate the Mn degree of the line segment

As shown in the figure, C is any point on AB, M is the midpoint of AC, and N is the midpoint of BC. If AB = 10cm, calculate the Mn degree of the line segment

How long is Mn?
AC+CB=AB=10
MC=AC/2,CN=CB/2
Mn = MC + CN = AC / 2 + CB / 2 = (AC + CB) / 2 = AB / 2 = 10 / 2 = 5cm