This past March, I was invited to speak about high school geometry to a college geometry class, one that we might describe as a Geometry for Teachers (GeT) class insofar as future teachers were an important, even if not the only, constituency. I was asked to talk about why high school students need to study […]

At the February GeT Seminar, Justin Dimmel made a compelling case for the use of light from the sun and stars as a naturally occurring context to study the geometry of parallel lines. One outcome of his work has been the ongoing development of a mathematical tool called the SunRule. By combining the geometry of […]

Sunlight provides an abundant, renewable, accessible source of naturally occurring rays that, for all intents and purposes, are parallel. It is the rare example of a real-world context with which nearly all children are familiar. Despite its familiarity and near universality, sunlight plays almost no part in K-12 mathematics classrooms. This is a missed opportunity […]

SLO 3: Secondary Geometry Understanding. Understand the ideas underlying the typical secondary geometry curriculum well enough to explain them to their own students and use them to inform their own teaching. While there are students who do not plan to teach geometry in Geometry for Teachers (GeT) courses at most institutions, it is required for […]

SLO #5  [Definitions] Understand the role of definitions in mathematical discourse: The role of definitions in mathematics is a rich area for students’ exploration that is often overlooked. In many math classes, definitions are given by the textbook or teacher. However, in a geometry class, definitions can be a fruitful area for students to explore. Students […]

SLO 9: Non-Euclidean Geometries.  Compare Euclidean geometry to other geometries such as hyperbolic or spherical geometry. Just as visiting another country can offer us a richer perspective on our own culture, so too can the study of non-Euclidean geometries help students to develop a deeper understanding of Euclidean geometry. While it is natural for students to be […]

We all know the past many months have presented challenging circumstances to do our work. Facing these challenges underscores the importance of personal and professional social networks to maintain one’s connection, productivity, and wellbeing. During the COVID-19 pandemic, CEDER, the organization contracted to do evaluation work on behalf of GeT Support, has used social network […]

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