I introduce the AA Postulate and the SAS & SSS to show you how to prove two triangles are similar. This video includes about 5 examples.
The last word in the definition of SAS for similar triangles should be similar, not congruent.
Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com
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