1. 6-1 Parallelograms Objectives:
To recognize and apply the properties of a parallelogram.

2. Vocabulary
Quadrilaterals
Parallelograms
Diagonals

3. Vocabulary A quadrilateral is a four-sided polygon.
A parallelogram is a quadrilateral with both pairs of opposite sides parallel.
The diagonals of a polygon are the segments that connect any two nonconsecutive vertices.

4. Theorems Theorem 6-1 Theorem 6-2 Theorem 6-3 Theorem 6-4
Opposite sides of a parallelogram are congruent.
Theorem 6-2
Opposite angles of a parallelogram are congruent.
Theorem 6-3
Consecutive Angles in a parallelogram are supplementary.
Theorem 6-4
The diagonals of a parallelogram bisect each other.

5. Example 1

6. Example 2

7. Homework
6-1 Worksheet