Answer:
[tex]MN=9.8\ m[/tex]
Step-by-step explanation:
The picture of the question in the attached figure
we know that
The Triangle 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
Point N is the midpoint segment JL and the point M is the midpoint segment KL
so
The segment MN is joining two sides of a triangle at the midpoints of those sides
therefore
MN is parallel to side JK and is half the length of JK
[tex]MN=\frac{1}{2}JK[/tex]
we have
[tex]JK=19.6\ m[/tex]
substitute
[tex]MN=\frac{1}{2}(19.6)=9.8\ m[/tex]
