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Test Review Talk with your partners about your tests. Bell-Ringer What are congruent figures? Give me 2 examples around the classroom. Chapter 4 Congruent Triangles Section 4-1 Congruent Figures Review: What makes angles ? same degree measurement What makes segments same length ? Can an angle be congruent to a segment? No…Why not? Can a triangle be congruent to a square? No…Why not? What makes figures congruent? Congruent Figures Two figures that have the same size and shape. If figures are congruent then they have congruent angles and congruent sides or parts. Labeling Congruent Figures Congruent figures must be labeled according to their corresponding parts. Label the following congruent figures. Possible Answers Δ1 Δ2 Δ ABC Δ EFD Δ BCA Δ FDE Δ CBA Δ DFE Δ2 Δ EFD Δ FDE Δ DEF Δ1 Δ ABC Δ BCA Δ CAB Δ3 Δ HGI Δ GHI Δ IHG Δ3 Δ HGI Δ GIH Δ IHG Given: Δ CAT Δ DOG Which angles are congruent to one another? C and D A and O T and G Which sides are congruent to one another? CA and DO; AC and OD AT and OG; TA and GO TC and GD; CT and DG To help solving draw a picture! Applications to Proofs When the definition of congruent triangles is used in a proof we write, Corr. parts of Δ are or CPCTC !!! Current Goal:Identify/label CPCTC. Future Goal: Use parts to prove that figures are and vice versa. All Together: Classroom Ex. pg 119 #1-20 AND Mixed Review # 1 & 2 page 121 HOMEWORK Pg120 #1-23 ODD Bring in 3 different color markers to write with!