1 The Question of Parallels We sketch a very brief history of certain aspects of geometry as background for the material in this book. Euclid is the central figure but is neither the beginning nor the end of our story.

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Date: 2016-01-17 19:31:11 Elementary geometry Foundations of geometry Non-Euclidean geometry Parallel postulate Angle Hyperbolic geometry Giovanni Girolamo Saccheri Saccheri quadrilateral Euclidean geometry Geometry Spherical geometry Omar Khayyam		1 The Question of Parallels We sketch a very brief history of certain aspects of geometry as background for the material in this book. Euclid is the central figure but is neither the beginning nor the end of our story. Add to Reading List Source URL: www.math.niu.edu Download Document from Source Website File Size: 169,63 KB Share Document on Facebook

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