Evaluation of Descriptive Geometry Dynamic Models Developed in Geogebra® for Online Teaching

Geogebra (R) is open-source software with a graphical interface directed to math and calculus teaching. Besides that, it is frequent to figure out teaching applications in geometry. This paper aims to demonstrate two applications of 3D dynamic models developed in Geogebra (R) directed to descriptive geometry online teaching. Specifically, the applications regard concepts that students struggle to acquire the visual skills to comprehend: the inclusion of lines in planes and the changing of projection planes. To evaluate the quality of the 3D models, we applied a quantitative-qualitative survey to descriptive geometry professors in Brazilian undergraduate courses, in which they could interact with the 3D models. The results indicated that the developed 3D dynamic models are adequate for online teaching applications. Additionally, they contain the essential features to support the visual skills teaching-learning process required in architecture and engineering courses. Finally, some limitations and suggestions of improvement were pointed out by the participants.