"Area without Numbers": Using Touchscreen Dynamic Geometry to Reason about Shape

Autor/inn/en	Ng, Oi-Lam; Sinclair, Nathalie
Titel	"Area without Numbers": Using Touchscreen Dynamic Geometry to Reason about Shape
Quelle	In: Canadian Journal of Science, Mathematics and Technology Education, 15 (2015) 1, S.84-101 (18 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1492-6156
DOI	10.1080/14926156.2014.993048
Schlagwörter	Junior High School Students; Geometry; Geometric Concepts; Educational Technology; Technology Uses in Education; Mathematics Instruction; Teaching Methods; Secondary School Mathematics; Handheld Devices; Technology Integration; Problem Solving; Observation; Student Evaluation; Concept Formation; Knowledge Level; Foreign Countries; Canada + Suchen Sie Ihr Suchwort? Junior High Schools; Student; Students; Sekundarstufe I; Schüler; Schülerin; Geometrie; Elementare Geometrie; Unterrichtsmedien; Technology enhanced learning; Technology aided learning; Technologieunterstütztes Lernen; Mathematics lessons; Mathematikunterricht; Teaching method; Lehrmethode; Unterrichtsmethode; Problemlösen; Beobachtung; Schulnote; Studentische Bewertung; Concept learning; Begriffsbildung; Wissensbasis; Ausland; Kanada
Abstract	In this article, we report on two lessons aimed at introducing junior high school students to the idea of shearing in a touchscreen dynamic geometry environment. By using shearing, we hoped to shift students' attention away from a formula-driven, computational conception of area toward a more geometric one. We found that the students were able to solve several problems involving the comparison of polygons based on verbal and diagrammatic explanations. We describe the features of the touchscreen dynamic geometry technology that supported their learning, as well as the specific role that the teacher played in modeling students' reasoning about area. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01