Question

Given: L is the midpoint of KM
M is the midpoint of LN
Prove: KL = MN

Answer 1

Because L is the midpoint of KM, we know that KL = LM.
Because M is the midpoint of LN, we know that LM = LN.
Therefore, KL = LM = LN QED

Answer 2

Proof in the attachment below.