Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 94: 46


1. The sum of the angles in a triangle is 180 degrees. 2. If the first two angles of both triangles are equal, then they take up the same fraction of the 180 degrees. 3. Thus, it follows that the same fraction of the 180 degrees must be left for the third angle in both cases. 4. Thus, the third angles are congruent.
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