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Wednesday, September 18 th. Warm Up. ∆
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Wednesday, September 18th
∆ 1. <g = ____________2. JG=_____________
Warm Up
LREGAJ
ImportantNext Quiz:
Friday 9/20PROOFS
The 5 Triangle Congruence's
*You must have these memorized by Friday!
Side-Side-Side (SSS) Congruence Postulate
All Three sides in one triangle are congruent to all
three sides in the other triangle
Side-Angle-Side (SAS) Congruence Postulate
Two sides and the INCLUDED angle
(the angle is in between the 2 marked sides)
Angle-Angle-Side (AAS) Congruence Postulate
Two Angles and One Side that is NOT
included
Angle-Side-Angle (ASA) Congruence Postulate
Two angles and the INCLUDED side(the side is in between the 2 marked
angles)
There is one more way to prove triangles congruent, but it’s only for RIGHT TRIANGLES…Hypotenuse Leg
The ONLY Ways To Prove
Triangles Are Congruent
NO BAD WORDS
2 markings you can add if they aren’t marked
already
Share a sideReason: reflexive
property
Vertical AnglesReason: Vertical Angles are congruent
Homework Answers
Extra Practice
1-12 Congruent Triangles
*Remember to draw in vertical angles and shared
sides
Today’s Goal
Triangle Proofs
Key Tips • First statement is always GIVEN. • Other statements may also be
GIVEN • Last statement should be what you
are trying to prove and be using one of our 5 triangle congruences (SSS, ASA, Etc.)
• Draw in your dashes and angles • Try to remember all the
rules/theorems/postulates we have covered since the beginning of the year!