Answer:
Step-by-step explanation:
12. 
Statements:
1. RS bistecs PQ at T; PQ bisects RS at T. 
2. RT is congruent to ST; PT is congruent to QT. 
3. Angle T is congruent to angle T. 
4. Triangle PTS is congruent to triangle QTR. 
Reasons:
1. Given. 
2. Definition of a bisector of a line segment. 
3. Reflexive Property. 
4. SAS Postulate
13. 
Statements:
1. AB is congruent to AD; AC bisects angle BAD. 
2. Angle BAC is congruent to angle DAC. 
3. AC is congruent to AC. 
4. Triangle ABC is congruent to triangle ADC. 
Reasons:
1. Given. 
2. Definition of a bisector of an angle. 
3. Reflexive Property. 
4. SAS Postulate.