#### Answer

$$ x^2+y^2=144$$

#### Work Step by Step

We know that the equation for a circle centered at the origin of radius r is $x^2+y^2=r^2$. Thus, the equation for this circle is:
$$x^2+y^2=12^2 \\ x^2+y^2=144$$

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Published by
McDougal Littell

ISBN 10:
0618595414

ISBN 13:
978-0-61859-541-9

$$ x^2+y^2=144$$

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