# Lesson 6.2

### By Georgia Blodgett

## Theorem 1

This theorem states that opposite sides of a parallelogram are congruent.

## Theorem 2

This states that opposite angles of a parallelogram are congruent.

Proof: Theorem 2

Sal proves that opposite angles of a parallelogram are congruent.

## Theorem 3

The diagonals of a parallelogram bisect each other.

## Theorem 4

If three (or more) parallel lines cut off congruent segments on one transversal, then they cut off congruent segments on every transversal.