Most of the files below are written by Mathematica
6. except the one which is written by Cabri2.
You need either Mathematica 6 or above / Mathematica player（free). The player can be downloaded from here（88Mbite).
To change the size of a CG, click the small vertical scale at the bottom right corner or directly click a CG and drag the green frame which will pop up around the CG. You can also change the view point with mouse.
You need plugins for Cabri2 to see a cabri file below, even if you have Cabri. 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.
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