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MBA, PHD
Phoniex
Jul-2007 - Jun-2012
Corportae Manager
ChevronTexaco Corporation
Feb-2009 - Nov-2016
Consider the theorems below:
The following is a theorem of Euclidean geometry:
Euclidean angle sum theorem: The sum of the measures of the angles of a triangle is 180°.
Theorem 1: An exterior angle of a triangle is greater than either of the nonadjacent interior angles of the triangle.
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A. Using the Euclidean angle sum theorem, prove Theorem 1. Your proof must refer to the definitions provided below.
Definitions:
•  adjacent: Two angles are adjacent if they share a common vertex and common side, and they do not overlap. Otherwise, the two angles are nonadjacent.
•  supplementary:Two angles are supplementary if their measures sum to 180°.
•  exterior:An angle that is both adjacent and supplementary to an angle of a triangle is an exterior angle of the triangle.
1. Explain why this theorem is also true in hyperbolic geometry.
2. Explain why this theorem is not true in spherical geometry.
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