Augmented Reality (AR) is a variation of Virtual Environments (VE), or Virtual Reality as it is more commonly called. In these so called Virtual Environments the user is completely surrounded by a synthetic environment. In that state, the user can not perceive the real world and the real environment that surrounds him/her. On the contrary, Augmented Reality (AR) allows the user to perceive the real world while the virtual elements are superimposed upon or composited with the real world. In this manner, the augmented reality is enriching the user's perception of the reality rather than totally replacing it like in the case of the virtual environments. The ultimate goal of the AR is to convince the user that the two environments, real and virtual, coexist. An application designed on the basis of the AR technology can provide the teacher with the ability to visually present to the students a three-dimensional shape created out of its two orthogonal projections presented in the textbook.