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Illustrative Math 4

Why does SSS work?

Why does SAS work?

Why does ASA work?

When does SSA work?

http://www.illustrativemathematics.org/illustrations/110

http://www.illustrativemathematics.org/illustrations/109

http://www.illustrativemathematics.org/illustrations/339

http://www.illustrativemathematics.org/illustrations/340
CK - 12 4

Triangle Congruence

SSS

SAS

ASA & AAS

 

HL

http://www.ck12.org/geometry/Triangle-Congruence/

http://www.ck12.org/geometry/SSS-Triangle-Congruence/

http://www.ck12.org/geometry/SAS-Triangle-Congruence/

http://www.ck12.org/geometry/ASA-and-
AAS-Triangle-Congruence/

http://www.ck12.org/geometry/HL-Triangle-Congruence/
Math is Fun 4 Triangle Congruence Criteria http://www.mathsisfun.com/geometry/triangles-
congruent-finding.html
NY Regents 5 Congruence of Triangles http://www.regentsprep.org/Regents/math/geometry/GP4/
indexGP4.htm
SHMOOP 4 Congruent Triangles http://www.shmoop.com/common-core-standards/
ccss-hs-g-co-8.html
Math Open Ref 5

SSS

SAS

ASA

AAS

HL

Not AAA

Not SSA

http://www.mathopenref.com/congruentsss.html

http://www.mathopenref.com/congruentsas.html

http://www.mathopenref.com/congruentasa.html

http://www.mathopenref.com/congruentaas.html

http://www.mathopenref.com/congruenthl.html

http://www.mathopenref.com/congruentaaa.html

http://www.mathopenref.com/congruentssa.html
Wikipedia 5 Criteria for Congruence - Also explains AAA & SSA https://en.wikipedia.org/wiki/Congruence_%28geometry%29
Princeton 3 Congruence definition by motion & more http://www.princeton.edu/~achaney/tmve/wiki100k/docs/
Congruence_%28geometry%29.html
       
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Mister Rutter 5 Review of the criteria http://www.youtube.com/watch?v=pZZADeU3khw
BrightStorm 5

SSS & SAS

ASA & AAS

Not AAA & Not SSA

http://www.youtube.com/watch?v=21of921lRKo

http://www.youtube.com/watch?v=q6CpJAuNBaE

http://www.youtube.com/watch?v=DWWwo4l_s9g
Khan Academy 5 A variety of resources https://www.khanacademy.org/math/geometry/
congruent-triangles
       
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NLVM   Very Cool Applet to explore the criteria http://nlvm.usu.edu/en/nav/frames_asid_165_g_3_t_3.
html?open=instructions
     

 
       
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