1. How do we prove triangles congruent using Side-Side-Side Postulate?
Aim:
Do Now:
In each example, state a plan for proving the triangles are congruent. )) ) 1) 2)
1. Reflexive Post. X
1. Reflexive Post.
2. A.S.A.
2. S.A.S. ) 3)
1. Supplements of congruent angles. (( 4)
2. Reflexive Post. X
1. S.S.S.
3. S.A.S.
Geometry Lesson: S.S.S. Postulate

2. Postulate: Postulate: Side-Side-Side Postulate (S.S.S.):
If the three sides of one triangle are congruent to the three sides of another triangle, then the two triangles are congruent.
Postulate:
Construct a congruent triangle by making three congruent sides.
Use a compass to find the intersection of two circles with radii of equal length as the remaining two sides.
Ex: Which sides must first be proved congruent in order to prove the triangles congruent using the S.S.S. Postulate? 1) A B C D 2) E F 3) X

3. R T P X Given: Prove: Ex 1: Proof w/S.S.S. Statement Reason 1) 2) 3)4) 5) 6)
Given
Given
Def. line bisector
Def. midpoint
Reflexive Postulate
S.S.S. Postulate
Geometry Lesson: S.S.S. Postulate

4. N Q P R E P N X L Q • P A V C R T Ex 2,3,4: Proofs w/S.S.S. 2) Given:
Prove: E P N X L Q •
3) Given:
Prove: P A V C R T
4) Given:
Prove:
Geometry Lesson: S.S.S. Postulate

5. A F C D B E K P H L E G H R N P Ex 5,6: Proofs w/S.S.S. 5) Given:
Prove:
Ex 5,6: Proofs w/S.S.S. K P H L
6) Given:
Prove: E G H R N P
Geometry Lesson: S.S.S. Postulate