Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 1 - Section 1.2 - Informal Geometry and Measurement - Exercises - Page 17: 16


$R$ is the point of intersection between lines $\overleftrightarrow{AB}$. The measures of $\angle1$ and $\angle2$ are equivalent.

Work Step by Step

Point R is the only point where both lines cross, so Point R is the point of intersection. The measures of vertical angles (angles opposite each other and formed by intersecting lines) are congruent. Angles 1 and 2 both fit this description, so the measures of $\angle1$ and $\angle2$ are equivalent.
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