Answer
222$^{\circ}$
Work Step by Step
m$\angle$3=.5(RST-(360-RST))
42=.5(2RST-360)
84=2RST-360
2RST=444
RST=222$^{\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: 12b
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