Answer
The angle addition postulate.
Work Step by Step
This postulate proves that the measure of a split angle is equal to the sum of the angles within it.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 1 - Section 1.3 - Introduction to Geometric Proof - Exercises - Page 54: 9
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