Warm Up  Which pair(s) of triangles has enough information given to prove that the triangles are congruent? For any that have enough information, tell.

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Presentation transcript:

Warm Up  Which pair(s) of triangles has enough information given to prove that the triangles are congruent? For any that have enough information, tell what triangle congruence postulate applies.

Announcements  Quiz on Thursday  Online Quiz assignments due on Wednesday (4-2, 4-3, and 4-4)

Two Column Proof What are the important elements of a two-column proof?

Paragraph Proofs

Flow Chart Proof

Proof Puzzle #1  First, separate statements and reasons.  Determine which statements are given.  Build the proof.  Copy the proof onto the large whiteboards.

Proof Puzzle #1 Debrief  How accurate is the diagram? Are the segments and angles that look congruent in the diagram actually congruent?  Are the corresponding parts labeled in the correct order?  Did any of the groups put markings in the diagram?  If there are different correct ways to order the statements in the proof, what are they?  Which statements must come ahead of other statements? Why?  For which statements or reasons can you predict the ordering?  How does this predictable order help you write a proof?

More Proof Puzzles  Complete the proof puzzles in your group. Copy the proofs into your notebook.