Warm

up is #1-2 of the “Ready” on pg.27

Warm Up

Unit 5 - Triangle CongruenceLesson 5.3 Congruent Triangles to the

rescue!

*Quiz tom

orrow*

Previous learning?

Objectives

-U

se the definition of congruence in terms of rigid

motions to show that two triangles are congruent if

and only if corresponding pairs of sides and corresponding pairs of angles are congruent.

-Explain how the criteria for triangle congruence (A

SA, SA

S, and SSS) follow from the definition of

congruence in terms of rigid m

otions.

Definition

Isosceles triangle: A triangle with at least two

congruent sides.

Definition

Isosceles triangle theorem: If two sides of a

triangle are congruent, then the angles opposite those sides are congruent.

Got it?

Homew

ork5.3 H

omework - Finish up the “Ready,

Set,” #3-9 on pages 27-29 of 2.5

Congruent Triangles to the Rescue