Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter P - Preliminary Concepts - Chapter P Review Exercises - Page 29: 24

Answer

Angle DEF has a measure of 90 degrees.

Work Step by Step

We are told that if an angle that we are given is a right angle, then it must have a measure of 90 degrees. Since angle DEF is a right angle, it follows that angle DEF must have a measure of 90 degrees.
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