Answered
https://www.geogebra.org/m/NJ3EKuyb
This is really interesting, is there step by step guide about how to do this?
Many thanks.
The same question 
https://www.geogebra.org/m/NJ3EKuyb
This is really interesting, is there step by step guide about how to do this?
Many thanks.
Maybe we can add a 'FOLD' option for Geometry.
hi, thanks for the appreciation. I did some time on creating this book myself, but I didn't use extraordinary commands. You 'just' have to look carefully which points have to be folded along which axis and to do so step by step, this to be combined with conditionally showing and hiding of objects. In general if you want to know how particular files are created there's one advise: download them an examine the created objects in the algebra and the construction protocol. It takes time but it pays itself back in growing skills.
chris
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