Most proofs require that you be able to prove two triangles congruent.



Watch these videos on YouTube:



http://www.youtube.com/watch?v=GgfY66ldfrk



http://www.youtube.com/watch?v=NAhcmPS5k9g&feature=fvw



and some of the others.





Here are some other sites you might try:



Involving SAS, where the corresponding parts are an angle between two sides



http://www.onlinemathlearning.com/triangle-congruence.html



http://www.mathwarehouse.com/geometry/congruent_triangles/side-angle-side-postulate.php



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



http://library.thinkquest.org/20991/geo/ctri.html



http://www.themathpage.com/abooki/propI-4.htm



http://www.jimloy.com/geometry/congruen.htm



http://www.onlinemathlearning.com/congruent-triangles.html



Involving ASA or AAS, where the corresponding parts in two triangles

that you want to prove congruent have two angles and a side corresponding 



http://www.onlinemathlearning.com/triangle-congruency.html



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



http://www.mathwarehouse.com/geometry/congruent_triangles/angle-side-angle-postulate.php



http://www.themathpage.com/abooki/propI-26.htm



Edwin 

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