2. Using Congruent Triangles Part 1 Keystone Geometry 11/08/2013

3. Proof Format When using CPCTC to prove that corresponding parts of a triangle are congruent, we use the same general format: o Determine the 3 pieces of congruency based on the given information and the diagram o Determine what the two congruent triangles are and the method of congruence o Use CPCTC to prove the corresponding parts.

4. Complete the following proof: StatementsReasons 3. DF = DF 4. ∆ = ∆ 5.

5. Complete the following proof: StatementsReasons 1. PR=SR; PQ=SQ1. Given 2. QR=QR2. Reflexive 3. ∆PQR= ∆SQR3. SSS Postulate 4. CPCTC

6. Complete the following proof: StatementsReasons 1. Given 2. AC=CD2. Def. of a Midpt. 3. Vertical Angles 4. ∆ABC= ∆DEC4. ASA Postulate 5. BC=EC5. CPCTC

7. Complete the following proof: StatementsReasons 1. WY┴ XZ; XY=YZ1. Given 2. If 2 lines are perp. then they form = adj. <s 3. WY=WY3. Reflexive 4. ∆XYW= ∆ZYW4. SAS Postulate 5. CPCTC