Using the given information. decide whether the two triangles must be congruent. If so, (a) write the congruence and (b) name the postulate or theorem that justifies your answer. If not, write none for both (a) and (b). 5. WY = XY; WZ = XZ 6. L W and LX are right angles; W WY = XY W Z Y X X 7. X is the midpoint of BC: 8. AD bisects BC: AB = D.C BC bisects AD. A A B X C B D D 9. QS bisects LRQT: 10. YZ bisects L WYX; QS _ RT R ZY bisects L WZX. W Q S Z Y T X 11. PQ = RS; QT = ST 12. LP and LR are right angles; P R QT = ST P R T Q S