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SB En Geom 42 Completed.notebook September 28, 2012 Lesson 42 Triangle Congruence by SSS and SAS How many noncongruent triangles can you form with the three sides? Oct 28:19 AM Postulate 41 SideSideSide (SSS) Postulate If three sides of one triangle are congruent to the three sides of another triangle, then the two triangles are congruent. Picture Expl 1. Write a flow proof to show the triangles congruent. B C A D Oct 28:23 AM 1 SB En Geom 42 Completed.notebook September 28, 2012 Ckpt 1. F Given: HF ≅ HJ, FG ≅ JK, H is the midpoint of GK Prove: ΔFGH ≅ ΔJKH 1. 1. 2. 2. 3. 3. G J H K Oct 28:28 AM included is used when referring to the angles and sides of a triangle a side is between two angles an angle is between two sides example... M N O Oct 28:29 AM 2 SB En Geom 42 Completed.notebook September 28, 2012 How many triangles can you form with two sides and an included angle? Oct 28:31 AM Postulate 42 SideAngleSide (SAS) Postulate If two sides and the included angle of one triangle are congruent to the two sides and the included angle of another triangle, then the two triangles are congruent. Oct 28:33 AM 3 SB En Geom 42 Completed.notebook September 28, 2012 Expl 2. What other information do you need to prove the triangles congruent by SAS? S R T K A 8 Ckpt 2. What other information do you need to prove ΔABC ≅ ΔCDA? 7 6 B D 7 C Oct 28:35 AM Expl 3 Can you prove ΔRED ≅ ΔCAT? Explain. A EC R T D Ckpt 3 Can you prove ΔAEB ≅ ΔDBC? Explain. A B C E D Oct 28:40 AM 4 SB En Geom 42 Completed.notebook September 28, 2012 Homework Lesson 4‐2 2‐42E, 44‐46 Oct 28:42 AM 5