what’s wrong with this picture?. warm-up turtle’s walk at 3-4 mph. snails top speed is 13 inches...
TRANSCRIPT
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