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 (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Section 1.5 - Introduction to Geometric Proof - Exercises - Page 44: 9
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