Answer
See image:
Work Step by Step
The $r=1$ indicates that this region is a part of the circle around the pole, with radius 1.
The angle ranges form $0$ to $\pi$, which covers the upper part of the circle.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 11: Parametric Equations and Polar Coordinates - Section 11.3 - Polar Coordinates - Exercises 11.3 - Page 663: 21
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