Question: Reflexive Property of Congruence

Answer: For any segment AB, segment AB is congruent to segment AB.

Question: Symmetric Property of Congruence

Answer: If segment AB is congruent to segment CD, then segment CD is congruent to segment AB.

Question: Transitive Property of Congruence

Answer: If segment AB is congruent to segment CD, and segment CD is congruent to segment EF, then segment AB is congruent to segment EF.

Question: Definition of Congruent Segments

Answer: If segment AB is congruent to segment CD, then the measure of segment AB is equal to the measure of segment CD (or vice versa)

Question: Definition of Midpoint

Answer: If M is the midpoinr of AB, then segment AM is congruent to segment AB, plus the measure of segment AM is equal to the measure of segment AB.