Proving Triangles Congruent VIDEOS ON CONGRUENT POLYGONS https
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Proving Triangles Congruent
VIDEOS ON CONGRUENT POLYGONS • https: //www. youtube. com/watch? v=DYD 2 h 8 S py https: //www. youtube. com/watch? v=ztzq _EC 9 LAk
The Idea of a Congruence Two geometric figures with exactly the same size and shape. F B A C E D
How much do you need to know. . . about two triangles to prove that they are congruent?
Corresponding Parts You learned that if all six pairs of corresponding parts (sides and angles) are congruent, then the triangles are congruent. B 1. AB DE 2. BC EF 3. AC DF 4. A D 5. B E 6. C F A C ABC DEF E F D
Do you need all six ? NO ! SSS SAS ASA AAS
Side-Side (SSS) B E F A C 1. AB DE 2. BC EF 3. AC DF D ABC DEF
Side-Angle-Side (SAS) B E F A C 1. AB DE 2. A D 3. AC DF D ABC DEF included angle
Included Angle The angle between two sides G I H
Included Angle Name the included angle: E Y S YE and ES E ES and YS S YS and YE Y
Angle-Side-Angle (ASA) B E F A C 1. A D 2. AB DE D ABC DEF 3. B E included side
Included Side The side between two angles GI HI GH
Included Side Name the included side: E Y S Y and E YE E and S ES S and Y SY
Angle-Side (AAS) B E F A C 1. A D 2. B E D ABC DEF 3. BC EF Non-included side
Warning: No SSA Postulate There is no such thing as an SSA postulate! E B F A C D NOT CONGRUENT
Warning: No AAA Postulate There is no such thing as an AAA postulate! E B A C D NOT CONGRUENT F
The Congruence Postulates F SSS correspondence F ASA correspondence F SAS correspondence F AAS correspondence F SSA correspondence F AAA correspondence
Name That Postulate (when possible) SAS SSA ASA SSS
Name That Postulate (when possible) AAA SAS ASA SSA
Name That Postulate (when possible) Reflexive Property SAS Vertical Angles SAS Reflexive Property SSA
HW: Name That Postulate (when possible)
HW: Name That Postulate (when possible)
Let’s Practice Indicate the additional information needed to enable us to apply the specified congruence postulate. For ASA: B D For SAS: AC FE For AAS: A F
HW Indicate the additional information needed to enable us to apply the specified congruence postulate. For ASA: For SAS: For AAS:
Write a congruence statement for each pair of triangles represented. D B A E C F
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Before we start…let’s get a few things straight C A Y B X INCLUDED SIDE Z
Angle-Side-Angle (ASA) Congruence Postulate Two angles and the INCLUDED side
Angle-Side (AAS) Congruence Postulate Two Angles and One Side that is NOT included
Your Only Ways To Prove Triangles Are Congruent
Things you can mark on a triangle when they aren’t marked. Overlapping sides are congruent in each triangle by the REFLEXIVE property Vertical Angles are congruent Alt Int Angles are congruent given parallel lines
Ex 1 DEF NLM
Ex 2 What other pair of angles needs to be marked so that the two triangles are congruent by AAS? D L M F E N
Ex 3 What other pair of angles needs to be marked so that the two triangles are congruent by ASA? D L M F E N
Determine if whether each pair of triangles is congruent by SSS, SAS, ASA, or AAS. If it is not possible to prove that they are congruent, write not possible. Ex 4 G K I H J ΔGIH ΔJIK by AAS
Determine if whether each pair of triangles is congruent by SSS, SAS, ASA, or AAS. If it is not possible to prove that they are congruent, write not possible. Ex 5 B A C D E ΔABC ΔEDC by ASA
Determine if whether each pair of triangles is congruent by SSS, SAS, ASA, or AAS. If it is not possible to prove that they are congruent, write not possible. Ex 6 E A C B D ΔACB ΔECD by SAS
Determine if whether each pair of triangles is congruent by SSS, SAS, ASA, or AAS. If it is not possible to prove that they are congruent, write not possible. Ex 7 J M K L ΔJMK ΔLKM by SAS or ASA
Determine if whether each pair of triangles is congruent by SSS, SAS, ASA, or AAS. If it is not possible to prove that they are congruent, write not possible. Ex 8 J T K L V Not possible U
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