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Triangle Sum Theorem! – It’s really easy! Triangle sum theorem is when all the sides of a triangle add up to be 180 degrees. For extra help, please watch the following video online. http://www.phschool.com/atschool/academy123/english/acade my123_content/wl-book-demo/ph-383s.html Then complete Skills Practice p. 725-726 #1-6 (do not tear out)