1. Opener
In a parallelogram one angle is 9 times the size of another. Find the measure of the angles and their supplements. Using the Information Given design a proof to show that opposite angles are congruent.

2. Opposite angles in a Parallelogram are Congruent.

3. Prove It:
Using 2 column
Paragraph Proof
Using Flow Chart

4. Paragraph Proof Given: ABCD is a Parallelogram
Prove: Angle A Congruent to Angle C
Angle B Congruent to Angle D
Opposite sides of a parallelogram are congruent, so _______ and ________. By Reflexive Property of Congruence, ________. Triangle ABD is congruent to Triangle CDB because of the _______ Congruence Postulate. Because _______ parts of congruent triangles are congruent. Angle A Congruent Angle C

5. Two Column Proof

6. Prove: T G Given: Parallelogram LENS and Parallelogram NGTH Prove: H N
Angle L Congruent Angle T
LS Parallel to GT
Angle E supplementary to Angle T H N E S L

7. Exit Slip
Pick One of the following
Pg. 317 in Textbook:
# 48
#49
#50