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The Cookie Monster encounters a cookie whose boundary is the equation 

$x^2+y^2 - 6.5 = x + 3 y$

 and is very confused. He wants to know if this cookie is a lunch-sized cookie or a snack-sized cookie. What is the radius of this cookie?

off-topic
 Mar 3, 2020
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By completing the square in x and y, we get that the radius of the circle is 4.

 Mar 4, 2020

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