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.