What’s wrong with this picture?

Warm-up

Turtle’s walk at3-4 mph.

Snails top speed is 13 inches in 2 minutes.

Wee!

Agenda

Homework Review Chapter 4 Identifying Congruent

Triangles 4-4 Proving Triangles Congruent

Chapter 3 “Retake” Test today.

4-3 Study Guide

4-3 Study Guide

4-3 Practice

4-3 Practice

4-3 Practice

Triangle Congruence Postulates

Proving two triangles to be congruent does not require you to determine that all six parts of the triangles are congruent (3 angles & 3 sides).   There are a few short cuts.... each short cut only requires you to find a particular three things.... and if you do... you prove congruence.

Postulate 4-1 SSS Postulate(Side-Side-Side)

If the sides of one triangle are congruent to the sides of a second triangle, then the triangles are congruent.

BDAB

CDCA

Side-Side-Side Examples

Postulate 4-2 SAS Postulate(Side-Angle-Side)

If two sides and the INCLUDED angle of one triangle are congruent to two sides and the INCLUDED angle of another triangle, then the triangles are congruent.

CDEABC

DCEACB

CEBC

CDAC

VerticalPair

Side-Angle-Side Examples

Postulate 4-3 ASA Postulate(Angle-Side-Angle)

If two angles and the INCLUDED side of one triangle are congruent to two angles and the INCLUDED side of another triangle, then the triangles are congruent.

CDEABC

DEAB

EDCBAC

DECABC

Angle-Side-Angle Example

Chapter 3 Retake

Answers Ahead

4-4 Study Guide

4-4 Study Guide

Homework

4-4 Study Guide and Practice