Answer
m$\angle$B=270$^{\circ}$
Work Step by Step
m$\angle$B=360-m$\angle$A-m$\angle$C-m$\angle$D
m$\angle$B=360-30-30-30
m$\angle$B=270$^{\circ}$
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 4 - Section 4.2 - The Parallelogram and Kite - Exercises - Page 195: 35
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