Hirotaka Ebisui Geometry Problems
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Files to download and experiment
Sketchpad files
Geometer's Sketchpad will be here
PDF files
MathPAD 2010 paper in Polish (Nicholas Copernicus University, August 2010)
ATCM 2010 paper with Jen-Chung Chuan and Hitoshi Nakawa (University of Malaya, December 2010)