Hi, Here are the links to those videos on rational trigonometry I
mentioned the other day.
WildTrig1: Why trig is hard
http://www.youtube.com/watch?v=ZYWHfvij94UWildTrig2: Quadrance via Pythagoras and Archimedes
http://www.youtube.com/watch?v=3GU9mGyxz04WildTrig3: Spread, angles and astronomy
http://www.youtube.com/watch?v=9wd0i44vK04WildTrig4: Five main laws of rational trigonometry
http://www.youtube.com/watch?v=Oe2DZc6BXZkWildTrig5: Applications of rational trigonometry
http://www.youtube.com/watch?v=BfqSln90zrARegards,
Norman Wildberger
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