Answer
Angle 9 appears to be a right angle.
Work Step by Step
When interior angles of traversal on two parallel lines are bisected then the angle where they meet is always a right angle.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 2 - Section 2.1 - The Parallel Postulate and Special Angles - Exercises - Page 78: 7
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