You need plugins for Cabri2/Cabri3D to see files embedded in htmls below, even if you have those softwares. To download plugins,please check these: cabri2 , cabri3D ．Once you install the plugins, you can manuplate figures on the files with mouse ． To move the whole figure, please drag with Ctrl key down . For reconstraction, please click the red inverted triangle. At the bottom, there are also original cabri files which you can directly manipulate with Cabri/Cabri3D SOFTWARE (not plugins)．

If you can read Japanese , you can get detailed explanations of these files and mathematical proves from the PDF section below. There are one-to-one links to Cabri/Geogebra files.   Note that , however, you should use 'back button' of your browser when you come back from these links, if you close the brouser, it also closes original PDFs.

Non Euclid geometry

mixedmoss.com

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