Hinge Theorem and Converse of Hinge Theorem
http://www.schooltube.com/video/81e507b6c8e94c03b883/5-7%20The%20Hinge%20Theorem
Indirect Proof
http://my.hrw.com/math06_07/nsmedia/lesson_videos/geo/player.html?contentSrc=6546/6546.xml
http://www.regentsprep.org/Regents/math/geometry/GP3b/indirectlesson.htm
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