Answer
$(b)$
Work Step by Step
We know that the sum of the 3 angles is $180$ degrees and that we have a right angle ($90$ degrees), hence the sum of the other two is: $180-90=90$ degrees.
Hence, the answer is $(b)$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 8 - Applications of Trigonometric Functions - 8.1 Right Triangle Trigonometry; Applications - 8.1 Assess Your Understanding - Page 519: 5
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