Investigating rates of change in volume without calculation leads to an enriched sense of the optimization process and encourages reflection and connection among different approaches.

Contributor Notes

Walter J. Whiteley,, is professor of mathematics and statistics at York University in Toronto and a member of the Faculty of the Graduate Program in Education. His research interests are discrete applied geometry and geometry education.

Ami Mamolo,, is an assistant professor in the Faculty of Education at York University. Her interests include university students' learning and understanding of mathematics.

(Corresponding author is Whiteley
(Corresponding author is Mamolo
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