Angles and squares
http://dmentrard.free.fr/GEOGEBRA/Maths/geogebrclassic/AnglesquarMD.html
[url=http://dmentrard.free.fr/GEOGEBRA/Maths/geogebrclassic/AnglesquarMD.html]http://dmentrard.free.fr/GEOGEBRA/Maths/geogebrclassic/AnglesquarMD.html[/url]
Information: Angles and squares