Harkness SS, Noblitt B. Pixels: Creating Lessons with Historical Connections Between Perimeter and Circumference. ojsm [Internet]. 2017 Jul. 31 [cited 2026 Apr. 29];76(2). Available from: https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/OJSM/article/view/5831