Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 1 - Review Exercises: 18a



Work Step by Step

Based on appearance, the angle is an obtuse angle because it is greater than 90$^{\circ}$ and less than 180$^{\circ}$.
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