Answer
The sum of the measures of $\angle1$ and $\angle2$ is 180.
Work Step by Step
According to the Law of Detachment, if the hypothesis of a true conditional matches a given statement, you can make a conclusion based on the conditional.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 2 - Reasoning and Proof - Chapter Review - Page 131: 28
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