1. Warm Up March 18
Find x Find x R 23 x
2x-1°
4x° 2 13 x° S T

2. EOCT Week 10 #2

3. QUIZ on Friday March 21st!!!

4. A theorem is any statement that you can prove
A theorem is any statement that you can prove. Once you have proven a theorem, you can use it as a reason in later proofs.

8. Prove the AAS Congruence Theorem
Prove the Angle-Angle-Side Congruence Theorem.
Write a proof.
GIVEN
BC EF
A D,
C F,
PROVE
ABC DEF

9. Example #2 – SAS – Postulate
Given: N is the midpoint of LW N is the midpoint of SK
Prove:
N is the midpoint of LW N is the midpoint of SK
Given
Definition of Midpoint
Vertical Angles are congruent
SAS Postulate

10. Example #3 – ASA – Postulate
Given: HA || KS
Prove:
HA || KS,
Given
Alt. Int. Angles are congruent
Vertical Angles are congruent
ASA Postulate

11. Example #5 – Column Proof
Given:
Prove:
has midpoint N
Given
A line to one of two || lines is to the other line.
Perpendicular lines intersect at 4 right angles.
Substitution, Def of Congruent Angles
Definition of Midpoint
SAS
CPCTC