Electronic Proceedings of the Twentythird Annual International Conference on Technology in Collegiate MathematicsDenver, Colorado, March 1720, 2011Paper C007
This is an electronic reprint, reproduced by permission of Pearson Education Inc. Originally appeared in the Proceedings of the Twentythird Annual International Conference on Technology in Collegiate Mathematics, ISBN 0321689844, Copyright (C) 2012 by Pearson Education, Inc. 
Moving Results in Plane Geometry and Complex Analysis Via GeoGebra 
Chris Frenzen
Naval Postgraduate School

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Euclid 'proved' SAS for triangles, moving one to coincide with the other. Still, it took 2000 years to introduce motion into geometry. With GeoGebra, moving figures bring clarity, insight into proofs, and excitement to geometry and complex analysis. Examples discussed include plane isometries and inversion in the complex plane.
Keyword(s): GeoGebra, geometry, complex variables