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 1 - Review Exercises - Page 74: 13

Answer

Part 1: $\angle$RST or $\angle$TSR Part 2: $\angle$S Part 3: The angle is greater than 90$^{\circ}$

Work Step by Step

Parts 1 and 2: These are the three possible angles. The two listed for part one follow the question's specifications. The one listed for part two follow the question's specifications as well. Part 3: The diagram clearly shows an obtuse angle, and therefore has a measure greater than 90 degrees.
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