Temari balls

We traditionally cap off Honors Geometry by ending the course with a brief exploration of non-Euclidean geometries. In recent years we have focused on geometry on the surface of a sphere; we ask freshmen to pretend that they are living on such a surface rather than on the flat Earth that they had been assuming all year up to that point. This year my co-teacher, who is much craftier than I, developed a hands-on unit in which students created Japanese temari balls and used them as a model for finding shortest paths, parallel “lines” (which don’t exist on the surface of a sphere), sums of angles in triangles, and other surprising results. With this beautiful craft, students had a hands-on experience that opened a gateway to non-Euclidean geometry.

     IMG_1416           Aviva's 5 temari balls smaller

Categories: Math, Teaching & Learning, Weston