Welcome to The Geometer's Sketchpad® Resource Center This Resource Center supports users of the award-winning Dynamic Geometry® mathematics visualization software, The Geometer's Sketchpad.
M. Mariotti. Proceedings of the 22nd Conference of the International Group for the Psychology of Mathematics Education, 1, Seite 180--195. Stellenbosch, South Africa, PME, University of Stellenbosch, (Juli 1998)