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The Geometry of the Sphere by John C. Polking

Small book cover: The Geometry of the Sphere

The Geometry of the Sphere
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Publisher: Rice University

Description:
We are interested here in the geometry of an ordinary sphere. In plane geometry we study points, lines, triangles, polygons, etc. On the sphere we have points, but there are no straight lines. Therefore it is natural to use great circles as replacements for lines. Then we can talk about triangles and polygons and other geometrical objects.

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