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View Resource The Geometry of a Sphere

John Polking of Rice University and the Park City Mathematics Institute makes available the Geometry of a Sphere Website. Sections included at the site are Basic Information about Spheres, Area on the Sphere, the Area of a Spherical Triangle: Girard's Theorem, Consequences of Girard's Theorem, a Proof of Euler's Formula, and Appendices. The site provides exercises in conjunction with diagrams and...

https://math.rice.edu/~pcmi/sphere/