[color=#999999][color=#999999][color=#999999]This activity belongs to the [i]GeoGebra book[/i] [url=https://www.geogebra.org/m/h3gbmymu]Linkages[/url].[/color][/color][/color][br][br]This construction shows an articulated cube, that is, twelve bars of unit length joined to form a cube. This cube is flexible, since the angle formed by each pair of concurrent bars at a vertex does not have to be right.[br][br]This model seems easy to build. However, it requires a strong and subtle combination of [b]Geo[/b]metry and Al[b]gebra[/b].[br][list][*]Note: this construct simulates 3D virtual space, using projections, instead of directly using GeoGebra's 3D Graphical View, because this view only appeared years after this work was published [[url=https://www.geogebra.org/m/h3gbmymu#material/dcmh7amw]1[/url]].[/*][/list]

[color=#999999]Author of the construction of GeoGebra: [color=#999999][url=https://www.geogebra.org/u/rafael]Rafael Losada[/url][/color][/color]