1. Proving Triangles Congruent

2. Two geometric figures with exactly the same size and shape. The Idea of a Congruence A C B D E F

3. How much do you need to know. . . . . . about two triangles to prove that they are congruent?

7. The angle between two sides Included Angle

8. Name the included angle: Y E and E S E S and Y S Y S and Y E Included Angle  E  S  Y S Y E

10. Name That Postulate SAS SSS SSA (when possible)

11. Name That Postulate (when possible) SAS AAA SSA

12. Name That Postulate (when possible) SAS SAS SAS Reflexive Property Vertical Angles Vertical Angles Reflexive Property SSA

13. You try! Name That Postulate (when possible)

14. (when possible) You try! Name That Postulate

15. Indicate the additional information needed to enable us to apply the specified congruence postulate. For SAS:

16. Point X is the midpoint of AE and BD. 1. Which segments are congruent? 2. Why is <1 congruent to <2? 3. Why is triangle ACB congruent to triangle ECD?