I introduce the Hinge Theorem which allows us to look at the size relationship between the angles and sides within multiple triangles. I work through many examples in this video. EXAMPLES AT 1:40 2:28 3:30 4:48 5:32 8:52 Find free review test, useful notes and more at http://www.mathplane.com/ If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage / profrobbob