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Spherical Trigonometry for Dummies: Proving we live on a flat earth

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N.-Y.: CreateSpace Independent Publishing Platform , 2015. - 26p.
Spherical Trigonometry for Dummies proves we live on a flat earth. Spherical Trigonometry is the study of curved triangles, triangles drawn on the surface of a sphere. The subject is practical, for example, because we don’t live on a sphere. The subject has numerous elegant and unexpected theorems. I give a few below.

Author(s): Salisbury B., Cohen L., Mack J.

Language: English
Commentary: 1705394
Tags: Математика;Элементарная математика;Элементарная геометрия;Тригонометрия