Final answer:
The Midpoint Theorem proves that AN = BN when N is the midpoint of AB.
Step-by-step explanation:
The Midpoint Theorem is a fundamental concept in geometry that establishes a relationship between the midpoint of a line segment and the congruence of the two resulting segments. Specifically, the theorem states that if a point (in this case, N) is the midpoint of a segment AB, then it divides the segment into two congruent parts. Applying this theorem to the situation where N is the midpoint of AB, it implies that the segments AN and BN are congruent. This theorem provides a foundational understanding of geometric relationships involving midpoints and contributes to the logical deduction of congruence in geometric figures.