Answer
$$ x^{2}+y^{2} =49$$
Work Step by Step
Since
\begin{align*}
r&=\sqrt{x^{2}+y^{2}}\\
r^{2}&=x^{2}+y^{2}
\end{align*}
Then
$$ x^{2}+y^{2} =49$$
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 617: 11
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