Question

what is the second reason? definition of midpoint given segment addition postulate definition of congruence

Explanation:

If B is the mid - point of AC, by the definition of mid - point, it divides the segment AC into two equal parts, so AB = BC. The first statement is that B is the mid - point of AC (given). The second statement is AB = BC. The reason for AB = BC when B is the mid - point of AC is the definition of mid - point.

Answer:

Definition of Midpoint