Half of a cube with ruled surfaces

Developed by [url=https://www.geogebra.org/u/jose+a+mora]Jose Antonio Mora[/url], adapted from "[url=https://www.geogebra.org/m/eyfs9ptx#material/rpcbed4j]La mitad del cubo 1[/url]".
– Diego Lieban, Jose Manuel Arranz

Information: Half of a cube with ruled surfaces