**Objective: **(same
as Day 3)

GA QCC: #16

**Lesson: Triangle
Congruence (SSS, SAS)**

**NAME: ________________________**

1. From the last lesson, we said that if 2
triangles are congruent, then the corresponding __angles__
and corresponding __sides__ are congruent. If we say it another
way, 6 pieces of information from one triangle is congruent to
the corresponding 6 pieces of information to the __other__
triangle.

2. The question is, "Do we __need to
know all 6 pieces of information__ on each triangle to conclude
that the 2 triangles are congruent?" The answer is "No."

3. There are 2 postulates (statements that
are given without proofs) that can be used to prove 2 triangles
are congruent to each other __without using all 6 pieces of information__
per triangle:

SSS: Side-Side-Side Triangle Congruence Postulate

SAS: Side-Angle-Side Triangle Congruence Postulate(which refers to side,

included angle, and side of one triangle...)

4. What both of these postulate say is that if we know these pieces of information (SSS, for example) of one triangle being congruent to the same information (ie, corresponding parts) of another triangle, then the 2 triangles are congruent. The same statement can be made for a SAS situation. As an example, the following triangles are congruent because of the SAS Congruence Postulate.

5. Click **HERE (Figure
3)** to answer the following questions. To prove the triangles
are congruent, state which postulate you would use (SSS or SAS),
both, or neither.

5a. ________________________ 5b. __________________________

5c. ________________________ 5d.___________________________

5e. ________________________ 5f. ___________________________