Calculus (3rd Edition)

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


$$r =\sqrt{5}$$

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*}
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