Answer
m$\angle$ ABC = x + y
Work Step by Step
Step 1: m$\angle$ 1 + m$\angle$ 2 = m$\angle$ ABC.
Step 2: Substitute x for m$\angle$ 1 and y for m$\angle$ 2.
Step 3: x + y = m$\angle$ ABC.
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 1.2 - Informal Geometry and Measurement - Exercises - Page 20: 44
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