In this paper, I discuss the potential transformations to teach K-12 geometry topics with the technology of 3D Pens, which enabled 3D models to be created instantly via one's moving hands. I draw on an example of using constructionist learning activities with 3D Pens to teach young children, 'how tall is the triangle?'

Contemporary scientific cognizance on the development of children and the possibilities of their education has altered the image of the child to such an extent that the majority of scholars speak of a New Paradigm. This paradigm defines the child as a unique, singular, complete and complex being who realizes his personality through…