Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-2 Points, Lines, and Planes - Got It? - Page 13: 2



Work Step by Step

To be opposite rays, the rays must share an endpoint. The endpoint is the first point in the name of the ray. $\overset\longrightarrow{EF}$ and $\overset\longrightarrow{FE}$ do not have the same endpoint, so they are not opposite rays.
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