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Discernment and Reasoning in Dynamic Geometry Environments

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Selected Regular Lectures from the 12th International Congress on Mathematical Education

Abstract

Dynamic Geometry Environments (DGE) give rise to a phenomenological domain where movement and variation together with visual and sensory-motor feedback can guide discernment of geometrical properties of figures. In particular, the drag-mode in DGE has been studied in pedagogical settings and gradually understood as a pedagogical tool that is conducive to mathematical reasoning, especially in the process of conjecture formation in geometry. The epistemic potential of the drag-mode in DGE lies in its relationship with the discernment of invariants. In this lecture, I will discuss means of discernment and reasoning for DGE based on a combined perspective that puts together elements from the Theory of Variation and the Maintaining Dragging Scheme. My focus is on an idea of invariant as the fundamental object of discernment. Furthermore, an idea of instrumented abduction is proposed to frame how such reasoning can be developed. Exploring by dragging is a powerful tool supporting geometrical reasoning. At the end, I will introduce a Dragging Exploration Principle that might help to cognitively connect the realm of DGE and the world of Euclidean Geometry.

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Notes

  1. 1.

    We remark that in other DGE like Geometer Sketchpad, for the same construction, r and s can be moved by directly dragging on them.

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Acknowledgment

I would like to express my gratitude to Anna Baccaglini-Frank and Maria Alessandra Mariotti for their contributions to the content of this lecture.

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Authors and Affiliations

  1. Hong Kong Baptist University, Kowloon, Hong Kong

    Allen Leung

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  1. Allen Leung
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Correspondence to Allen Leung .

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  1. Seoul National University, Seoul, Korea, Republic of (South Korea)

    Sung Je Cho

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Leung, A. (2015). Discernment and Reasoning in Dynamic Geometry Environments. In: Cho, S. (eds) Selected Regular Lectures from the 12th International Congress on Mathematical Education. Springer, Cham. https://doi.org/10.1007/978-3-319-17187-6_26

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