1. Bell Ringer  We know that opposite sides of parallelograms are both congruent and parallel. We know that opposite angles of parallelograms are congruent. We know the diagonals of a parallelogram bisect each other. We know that consecutive angles of a parallelogram are supplementary. We use what we know to prove that quadrilaterals are parallelograms. You will need to memorize this list!  COPY the Concept Summary on p. 340 in the Geometry book “ Proving Quadrilaterals are Parallelograms ”. You will need to memorize this list!

2. Proving a Quadrilateral is a Parallelogram Tuesday, February 2, 2016

3. Two-Column Proofs Ex. 1: StatementsReasons 1. 2. 3.

4. Two-Column Proofs Ex. 2: StatementsReasons 1. 2. 3. 4.

5. Two-Column Proofs Ex. 3: StatementsReasons 1. 2. 3. 4. 5.

6. Two-Column Proofs Ex. 4: StatementsReasons 1. 2. 3.

7. Two-Column Proofs Ex. 5: StatementsReasons 1. 2. 3.

8. Parallelogram Proof Cut Outs

9. Assignments  In partner pairs, complete the 3 Classwork Cut Out Proofs.  Homework: One Cut Out Proof.

10. Exit Ticket  How many ways can you prove a quadrilateral is a parallelogram? List them.