Abstract
This chapter aims at discussing the mediation of technological resources done in geometry classes, in particular, for the teaching of polyhedral-prisms and pyramids – in primary school. The focus is to understand teaching actions and the use of technological resources by observing two teachers on geometry classes and analyzing results from this “in loco” survey. Zeichner’s ideas about teacher’s reflective practice and the view of Serrazina about the teacher as a manager of curriculum defined the theoretical framework. The methodology was qualitative, grounded in the complexity theory. We observed two different teachers’ actions and the mediation of available resources in order to help students’ participation and the development of the classes.
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Notes
- 1.
You can set the cavalier perspective as an oblique cylindrical projection on a plane parallel to one of the main faces of the object . Most representations of geometric figures in the books are in cavalier perspective. In cavalier perspective, there are the following properties : (1) figures and segments parallel to the plane of projection (paper plane) are represented in true greatness; congruent figures, situated in different planes, but parallel to the plane of the paper, have congruent representations-this is contrary to the vision, but according to the reality of the objects ; (2) perpendicular threads to the plane of the paper are represented by oblique segments (if adopted, making angles of 30° to the bottom edge of the paper), and has reduced its length (if adopted, the reduction of 50); (3) parallel to each other and straight segments are represented by straight parallel segments and each other (it is a cylindrical projection); (4) keep the midpoints of the segments and the centroid of figures; (5) as Convention , trace the lines that are visible to the observer and trace the invisible lines . Fonte: http://www.apm.pt/apm/geometria/inoveg/egtext1.html
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Lobo da Costa, N.M., de Carvalho, M.C.P., Campos, T.M.M. (2017). Mediation of Technological Resources in Lessons on Polyhedra: Analysis of Two Teaching Actions. In: Aldon, G., Hitt, F., Bazzini, L., Gellert, U. (eds) Mathematics and Technology. Advances in Mathematics Education. Springer, Cham. https://doi.org/10.1007/978-3-319-51380-5_3
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