Answer
$$r =\sqrt{5}$$
Work Step by Step
Recall that $x^2+y^2=r^2$:
\begin{align*}
x^2+y^2&=5\\
r^2&=5\\
r&=\sqrt{5}
\end{align*}
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 12 - Parametric Equations, Polar Coordinates, and Conic Sections - 12.3 Polar Coordinates - Exercises - Page 618: 17
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