[right][size=50][color=#980000][i][b]Hints: [/b][/i][br]geogebra-book [url=https://www.geogebra.org/m/ajzpzrbj]Möbius-Werkzeuge circle-tools[/url][br]geogebra-book [url=https://www.geogebra.org/m/mQgUFHZh]Kegelschnitt-Werkzeuge[/url][br]geogebra-book [url=https://www.geogebra.org/m/s2797fyc]Kugel-Kegel-Schnitte[/url][/color][br][/size][/right][br]