TY - GEN
T1 - Swedish students' exploration of trigonometrical relationships: GeoGebra and protractors yield qualitatively different insights
AU - Kai-Larsen, Ella
AU - Rimeslåtten, Marie
AU - Szabo, Attila
AU - Andrews, Paul Robert
PY - 2022
Y1 - 2022
N2 - Trigonometry, an important prerequisite for many advanced topics of school mathematics, links geometric, algebraic and graphical reasoning, but remains a difficult topic to teach and learn. The dynamic nature of many trigonometric functions is amenable to dynamic geometry software, which, in the form of GeoGebra, is the focus of this paper. However, both generally and in respect of trigonometry, research on GeoGebra's efficacy seems ambivalent. In this paper, we offer a case study of two groups of Swedish upper secondary students' solutions to the same tasks. One group was instructed to use GeoGebra and the other a protractor to investigate the sine and cosine functions in in the interval 0° ≤ v ≤ 180°. Analyses yielded qualitatively different outcomes; students using the protractor typically identified a geometrical relationship based on symmetry around the protractor's 90° line, while those using GeoGebra tended to identify only numerical relationships.
AB - Trigonometry, an important prerequisite for many advanced topics of school mathematics, links geometric, algebraic and graphical reasoning, but remains a difficult topic to teach and learn. The dynamic nature of many trigonometric functions is amenable to dynamic geometry software, which, in the form of GeoGebra, is the focus of this paper. However, both generally and in respect of trigonometry, research on GeoGebra's efficacy seems ambivalent. In this paper, we offer a case study of two groups of Swedish upper secondary students' solutions to the same tasks. One group was instructed to use GeoGebra and the other a protractor to investigate the sine and cosine functions in in the interval 0° ≤ v ≤ 180°. Analyses yielded qualitatively different outcomes; students using the protractor typically identified a geometrical relationship based on symmetry around the protractor's 90° line, while those using GeoGebra tended to identify only numerical relationships.
M3 - Conference contribution to proceeding
SN - 9791221025378
T3 - CERME Proceedings Series
SP - 2765
EP - 2772
BT - Proceedings of the Twelfth Congress of the European Society for Research in Mathematics Education
A2 - Hodgen, Jeremy
A2 - Geraniou, Eirini
A2 - Bolondi, Giorgio
A2 - Ferretti, Federica
PB - European Society for Research in Mathematics Education
ER -