Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 107: 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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