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ERIC Number: EJ1056789
Record Type: Journal
Publication Date: 2015
Pages: 18
Abstractor: As Provided
ISSN: ISSN-1492-6156
"Area without Numbers": Using Touchscreen Dynamic Geometry to Reason about Shape
Ng, Oi-Lam; Sinclair, Nathalie
Canadian Journal of Science, Mathematics and Technology Education, v15 n1 p84-101 2015
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.
Routledge. Available from: Taylor & Francis, Ltd. 325 Chestnut Street Suite 800, Philadelphia, PA 19106. Tel: 800-354-1420; Fax: 215-625-2940; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: Junior High Schools; Secondary Education; Middle Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Canada
Grant or Contract Numbers: N/A