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Matt B. Roscoe

Having prospective teachers find the inscribed angle theorem for themselves can foster mathematical reasoning.

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Bobson Wong and Larisa Bukalov

Parallel geometry tasks with four levels of complexity involve students in writing and understanding proof.

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Gloriana González and Anna F. DeJarnette

An open-ended problem about a circle illustrates how problem-based instruction can enable students to develop reasoning and sense-making skills.

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Irina Lyublinskaya and Dan Funsch

Symbolic geometry software, such as Geometry Expressions, can guide students as they develop strategies for proofs.

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Ellipses are the focus of photographs and mathematical equations.

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Günhan Caglayan

Students analyze a photograph to solve mathematical questions related to the images captured in the photograph. This month, photographs of ancient arches lead to a discussion of inscribed polygons.

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A cartoon exploring a problem about cutting up pizza is coupled with a full-page activity sheet.

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A set of problems of many types

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A set of problems of many types.

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A set of problems of many types.