We will solve as follows:
Statement: RS Congruent with RT // Ru bisects angle SRT.
Reason: Given.
Statement: m<1 = m<2.
Reason: Result of RU bisecting
Statement: RU = RU.
Reason: Ru is a common side for triangles SRU & triangle TRU.
Statement: triangle SRU is congruent with triangle TRU.
Reason: The triangles are congruent by SAS [SR congruent with RT, RU common side, and angle 1 congruent with angle 2; what's inside brackets should not be written]
Statement:
Reason: Corresponding angles from congruent triangles are congruent.