Two or more triangles are congruent if on comparison, they have equal lengths of sides, and measure of angles.
Therefore, the required proofs for each question are shown below:
Problem 1:
Congruent triangles are triangles with equal lengths of corresponding sides and measures of internal angles.
Thus,
           STATEMENT              REASON
1. <NMQ ≅ <NPQ               Any point on a perpendicular bisector   Â
                            makes equal measure of angle with the
                            two ends of the line segment.
2. NQ ⊥ MP                   Definition of a line.
3. MQ ≅ PQ                   Equal segments of a bisected line.
4. MN ≅ PN                   Any point on a perpendicular bisector  Â
                            is at the same distance to the
                            two ends of the line segment.
5. <MNQ ≅ <PNQ              Equal measure of the bisected angle.
Problem 2:
A line segment is the shortest distance between two points.
      STATEMENTS           REASONS
1. m<PSR  ≅ m<PSQ         A perpendicular bisector is always at a right Â
                         angle to the bisected line segment.
2. m<RPS ≅ m<QPS         Equal measure of the bisected angle.
3. RS ≅ QS                 Property of a bisected line segment.
4. PR ≅ PQ                 Any point on a perpendicular bisector  Â
                         is at the same distance to the two ends of Â
                         the line segment.
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