I love tearing the corners of a triangle to make the straight line. I have a tough crowd this year, so little amuses them. Typical the connection is made and they know the angles of a triangle add up to equal 180. This also shows how how the 2 remote angles add up to equal the measure of the exterior angle. The terms on the note cards were terms I thought my students had mastered in middle school, but Friday we spent time reviewing the terms again. Teacher lesson, never assume especially in a tech class. 
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