1. Parallelograms

2. 5 Ways to Prove a Quadrilateral is a Parallelogram
1. Show both pairs of opposite sides are parallel.

3. 5 Ways to Prove a Quadrilateral is a Parallelogram
2. Show both pairs of opposite sides are congruent.

4. 5 Ways to Prove a Quadrilateral is a Parallelogram
3. Show both pairs of opposite angles are congruent.

5. 5 Ways to Prove a Quadrilateral is a Parallelogram
4. Show one pair of opposite sides are congruent and parallel.

6. 5 Ways to Prove a Quadrilateral is a Parallelogram
5. Show the diagonals bisect each other.

7. Example: Find the values of x and y

8. Example

9. Notecard 11: Consecutive angles in a parallelogram

10. Example: Find the measure of angle L