1. Relevance: logical reasoning and using evidence to prove a point
Sections 2-6 & 2-7: Geometric Proofs: Two-Column, Flowchart and Paragraph Proofs
Rigor: Write geometric proofs in the format of two-column proofs, flowchart proofs and paragraph proofs
Relevance: logical reasoning and using evidence to prove a point

2. REVIEW! Two – Column Proofs Format
Statements
First statement is always given info
This side is for work
No skipping steps
Last line is ALWAYS what you are asked to find/prove
Reasons
First reason is always GIVEN (from picture, words, definitions)
Definitions, theorems, properties, formulas go here
The last reason is NEVER “prove”

3. Structure of a Flowchart Proof
Given Info
Given Info
Reason: Given
Reason: Given
Statement
Statement
Reason
Reason
NOTE: Only 1 statement/equation can go in each bubble!
Final Conclusion (what your asked to prove)
Reason

4. Structure of a Paragraph Proof
Take each statement and its corresponding reason and write a sentence.
Sentences should go in the same order that a two- column proof or a flowchart proof would.
Use your English writing skills to change up sentence structure! You are allowed to put statement first or reason first!

5. Common Segments Theorem Proof
Workbook page 80
Complete the two-column proof
Rewrite the two-column proof as a paragraph proof
Finally we shall turn it into a flowchart proof and compare and contrast the three formats.

6. Puzzle Time! Break into groups of 3 or 4
Work as a team to complete the 3 proofs in your puzzle packet by writing the correct statement or reason in space provided. Use the answer bank!
Once you have completed the proofs, discuss with your team which format you prefer and why.
Be ready to discuss your answers and preferences with the class.

7. Pick your Proof Style!
Which proof format do you like the best: two column, flowchart, or paragraph?
Get a template for the Vertical Angles Theorem in the format your liked best.
Complete the proof of the vertical angles theorem and turn it in to me for a grade.

8. Add these theorems to your notes
Proof of this theorem is on pg 80 of your workbook!

9. More Theorems to add to your notes
The Linear Pair Theorem – If two angles form a linear pair, then they are supplementary
Vertical Angles Theorem – Vertical angles are congruent
Right Angle Congruence Theorem – All right angles are congruent
Proof of this theorem is on pg 75 of your workbook!
Proof of this theorem is on pg 76 & pg 79 of your workbook!

10. 2-6 & 2-7 Assignment from the Workbook
pg 77 ALL
Pg 78 #2, 3 (honors also #1)
pg 81 – 82 ALL
Due Monday 10/17 (periods 1, 5, & 7)
Due Tuesday 10/18 (periods 2, 4, & 6)