Answer:
![MN=58\ cm](https://img.qammunity.org/2021/formulas/mathematics/high-school/idnmauo1aoiujvf9cz1lh8788jfaoa7j4p.png)
Explanation:
we know that
The Midpoint Theorem states that the segment joining two sides of a triangle at the midpoints of those sides is parallel to the third side and is half the length of the third side
In this problem
M is the mid-point segment AB
N is the mid-point segment BC
so
Applying the Midpoint Theorem
MN is parallel to AC
![MN=(1)/(2)AC](https://img.qammunity.org/2021/formulas/mathematics/high-school/cn0dn4x5n96yqk1tugnxj9717rln50jq18.png)
we have that
---> given problem
substitute
![MN=(1)/(2)(116)](https://img.qammunity.org/2021/formulas/mathematics/high-school/4wu9qtxcmtsyfe2w9vh2hhr15bxpub27hj.png)
![MN=58\ cm](https://img.qammunity.org/2021/formulas/mathematics/high-school/idnmauo1aoiujvf9cz1lh8788jfaoa7j4p.png)