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 detailed summaries of discussed topics. This resource should be very useful to high school as well as undergraduate students.
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