Answer
The two sets are disjoint.
Work Step by Step
If a triangle is right, it can never be obtuse, and vice versa.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 3 - Section 3.3 - Isosceles Triangles - Exercises - Page 159: 13
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