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 - P.3 - Informal Geometry and Measurement - Exercises P.3 - Page 24: 34

Answer

ABD

Work Step by Step

We are looking for the angle which is bisected, which means we need to find the angle which is cut into two equal sized angles. Here, we see that ABD is a 20 degree angle which is cut into two 10 degree angles. Thus, angle ABD is bisected.
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