A large topic but very rich and may-be the start of a new project next year?

left picture                             right picture

3d in reality: The High Trestle Trail Bridge in Iowa (US)

The picture left shows the High Trestle Trail Bridge (Iowa, US) - in realty a wonderful 3d object. the picture at the right is the plan of the bridge- in 2d . this could be modeled with GeoGebra or with Scratch.

project: 3d objects (Cro)