Wednesday, September 18 th

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!