Warmup Find the measure of angle 2

How do we analyze congruence in triangles? AGENDA: WARMUP – GUIDED NOTES – CPCTC PRACTICE

The symbol for is Whenever two figures have the same shape and size the figures are called congruent to .. Two triangles are congruent if and only if their vertices can be matched up so that the corresponding parts (angles and sides) of the triangles are congruent (CPCTC). congruent. Corresponding Parts of Congruent Triangles are Congruent.

A B C L M N Corresponding SidesCorresponding Angles  A   B   C  LL MM NN AB  LM MNBC  AC  LN  ABC   LMN

If  ABC   LMN… 1. If AB = 5, then LM = ____ 2. If m  B = 80, then m  M = _____. 3. If m  B = 80,  m  A = 60, then m  N = _____ m  M = 80 m  L = 60 40

If  CAT   DOG, then…. 1. Name the 3 pairs of corresponding sides. 2. Name the 3 pairs of corresponding angles. 3. Is it correct to say  ACT   ODG? 4. Is it correct to say  TAC   GDO?  C  A  T DD OO GG CA  AT  CT  DOOGDG Yes No

B A O D C 1.  ABO  _______ 2.  A  ______ 3. AO  ______ 4. BO  ______ 5.  BOA  _______  CDO CC  DOC DO CO Example 1

L B K H A C O R S E 1. Pentagon BLACK  ______________ 2.  A  ______3. LB  ______ 4. RS  ______ 5. Pentagon CKBLA  _______________ Example 2 Pentagon HORSE RR Pentagon SEHOR OH AC

R P T S R T S T S P 1.  RTS  _______2.  PST  ______ 3. RT  ______4. RS  ______ Example 3  PST  RTS PS PT

E D B A C F 2x - 8 x + 2 6w 3y + 3 5y - 7 9w - 12  ABC   DEF

 CAT   DOG D G O T C A x + 8 3w + 1 3y + 9 5x 4w 10y - 5

Exit ticket Text p. 237 #21-26