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Aaron Trocki

The advent of dynamic geometry software has changed the way students draw, construct, and measure by using virtual tools instead of or along with physical tools. Use of technology in general and of dynamic geometry in particular has gained traction in mathematics education, as evidenced in the Common Core State Standards for Mathematics (CCSSI 2010).

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Samuel Obara and Zhonghong Jiang

Applying Zometool, vZome software, and The Geometer's Sketchpad to tetrahedrons nested in cubes enhances students' spatial visualization skills.

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Wayne Nirode

Using a 6-inch-square sheet of paper and a simple rule for creating a polygon, students can explore interesting area and perimeter problems.

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Taehoon Choi and Dae S. Hong

Using iPad's GeoGebra app with the Snell-Huygens method significantly improves Archimedes's process of approximating Pi.

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Michael Todd Edwards, Suzanne R. Harper and Dana C. Cox

The Meeting for Lunch problem exemplifies how standards provide more than an outline of daily activities for an entire school year.

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S. Louise Gould

Pop-up polyhedra–three-dimensional models that can be stored for future reference–are easily constructed using The Geometer's Sketchpad and give students experience in using transformations in the plane.

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Anna E. Baccaglini-Frank

In this activity, students learn to make conjectures about properties that do not change.

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Dae S. Hong

This article shows how to explore the golden ratio using GSP. Golden rectangles, spirals, triangles, and pentagons are also discussed.

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Timothy McKeny and Joanne Caniglia

Students analyze a photograph to solve mathematical questions related to the images captured in the photograph. This month, the art of sculptor and painter Sol LeWitt is analyzed. Counting, combinatorics, and spatial visualization are among the mathematical themes evinced.

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Terrie T. Poehl

Voronoi diagrams, graph theory, and geography are used to explain and demonstrate sample ground and air transportation networks.