# Proving Triangles Congruent. The Congruence Postulates  SSS correspondence  ASA correspondence  SAS correspondence  AAS correspondence  SSA correspondence

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• Proving Triangles Congruent

• The Congruence Postulates

• Row Game Practice!-Each row is a team-Everyone gets a white board and marker-I will check first persons answer. If its correct, your team gets 7 points!-If first persons answer is not correct, I will check everyone elses in your row. Each correct answer is 1 point for your team.-Switch seats so everyone gets a chance to be the 1st person-Winning team gets candy!

• Name That TheoremSASASASSSSSA(when possible)

• Name That Theorem(when possible)ASASASAAASSA

• (when possible)SASSASSASReflexive PropertyVertical AnglesVertical AnglesReflexive PropertySSAName That Theorem and the property thathelps you get there

• Name That Theorem and the property thathelps you get there(when possible)Perpendicular BisectorSASAlt. Int. Angles TheoremSASAASReflexive Property

• Find the values of a and b that yields congruent trianglesa = 6 b = 15

• Quick Review!Given ABC is a triangle, find the measure of each angle. Then classify the triangle by its angles and sides.mA = 2x + 5, mB = 3x 15 and m C = 4x + 1o

Right Isosceles

• Quick Review! Find the measure of the exterior angle.

120

• Getting into formal proofsWe will now use one of the 6 theorems to complete some formal proofs that show whether or not 2 triangles are congruent.

• What theorem completes this proof?

• What theorem completes this proof?

• Try one on your own! What theorem completes this proof?

• Homework2 Assignments:

Textbookpg. 271 #27-28, 31

Triangle Congruence Theorems WS

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