The GeoGebra files
The constructions themselves, live. Choose a file and it opens here in GeoGebra: drag the points, zoom with the mouse wheel, and read the measurements. Download any file to keep working on it in GeoGebra.
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All the files
The repository holds GeoGebra files, including the working studies. Click a name to open it here; ⤓ downloads it. Downloaded files open in GeoGebra Classic (free, geogebra.org/download) or online at geogebra.org/classic (menu → Open).