1. Bellwork
From the exercise on the left identify all the postulates and properties that you can.  Also note which step you see them in.  By the way, what happened?  2=1? Really?

2. 2.5: Proving Statements about Segments and Angles.
In mathematics, quantities defined to be congruent have the same same size and shape. 
How does congruent differ from similar?

3. 2.5: Proving Statements about Segments and Angles.
Recall Biconditional Statements.  If and only if is often written as iff.
Two angles are supplements iff they sum to 180 degrees.
Two angles are complements iff their sum is 90 degrees.

4. Postulates and Theorems
          Statement
               Reason
How does a postulate differ 
from a theorem?
from an axiom? 
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5. 2.6: Proving Geometric Relationships
Find the values of x and y from the diagrams below.
I Do:                                      We Do: 
*If time allows solve each problem using two different methods.

6. 2.6: Proving Geometric Relationships
Describe and correct the error in using the diagram to find the value of x.
We Do:                                                                      You Do: