Answer:
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
we have
substitute