Answer
138$^{\circ}$
Work Step by Step
m$\angle$3=.5(RST-RT)
m$\angle$3=.5(360-RT-RT)
42=.5(360-2RT)
84=360-2RT
2RT=276
RT=138$^{\circ}$
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 6 - Section 6.2 - More Angle Measures in the Circle - Exercises - Page 297: 12a
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