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Answer:
Exercise 1:
1. opposite, congruent
2. opposite, congruent
3. its the same as number 2: opposite, congruent
4. diagonals
5. diagonals, congruent triangles
6. parallel, congruent
Exercise 2:
1. The quadrilateral is a parallelogram because both pairs of opposite sides are congruent
2. The quadrilateral is a parallelogram because both pairs of opposite angles are congruent
3. The quadrilateral is a parallelogram because the diagonals bisect each other
4. The quadrilateral is a parallelogram because the diagonal divides the parallelogram into two congruent triangles.
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