Answer
supplementary angles
Work Step by Step
The angles 4 and 5 are called supplementary angles since $\angle 4 + \angle 5=180^{\circ}$.
They can also be called adjacent angles.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 12 - Review - Page 443: 4
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