2. RS ≅ ST Definition of midpoint.
4. RS ≅ XY Transitive property of congruence.
explanation:
Statement reason
1) S is the midpoint of RT Given
2) RS ≅ ST Definition of midpoint.
3) ST ≅ XY Given
4) RS ≅ XY Transitive property of congruence.
2) Since RT is a line and the point S is the midpoint of line RT, then the point S is marked exactly at the mid of the line cutting it into two equal halves(Definition of midpoint). So, the measure of length RS = ST.
4) If RS is equal to the another line segment XY, then the measure of length RS is same for the length of line segment XY. (Transitive Property)
