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Rethinking Pythagoras
This article explores analogues of the Pythagorean Theorem in non-Euclidean geometries.
Loci
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Geometry Playground
Activity: Projective Geometry
This activity explores projective geometry, comparing it to Euclidean and Spherical geometries.
Click here to open the Geometry Playground applet in a new window.
Click here to open a pdf file which contains the instructions for the activity.
Next page >> Activity: Comparing Spherical and Hyperbolic Geometries
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Heath, Daniel and Joshua Jacobs, "Geometry Playground," Loci (September 2010), DOI: 10.4169/loci003567