#### 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.

Published by
Prentice Hall

ISBN 10:
0133281159

ISBN 13:
978-0-13328-115-6

The sum of the measures of $\angle1$ and $\angle2$ is 180.

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