3D Geogebra Challenges before my vacation

These three Geogebra  files in 3D  were made with the 4.25version of GeoGebra .(Yes, Yes!)

Try doing the same with Geogebra5.

So good holidays to you too?

 

https://www.youtube.com/watch?v=E8VyssX_oGU

  

https://www.youtube.com/watch?v=fQmuEgP0YMM

  

https://www.youtube.com/watch?v=TgqchR0LYTk