Answer
$55.8^\circ$
Work Step by Step
Since the sum of all the angles of a triangle is $180$ degrees, then we have
$$
90+34.2+B=180\Longrightarrow B=180-90-34.2=55.8^\circ
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 13 - Test - Page 470: 7
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