Finding the Radius and Center of a Circle with x2+y2=16

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Homework Statement


how do you find the radius and center with x2+y2=16 of a circle graph


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The Attempt at a Solution


I am completely stump don't even know where to start on this.
 
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Do you know the standard form for the equation of a circle that has radius r?
 
Thread 'Use greedy vertex coloring algorithm to prove the upper bound of χ'
Hi! I am struggling with the exercise I mentioned under "Homework statement". The exercise is about a specific "greedy vertex coloring algorithm". One definition (which matches what my book uses) can be found here: https://people.cs.uchicago.edu/~laci/HANDOUTS/greedycoloring.pdf Here is also a screenshot of the relevant parts of the linked PDF, i.e. the def. of the algorithm: Sadly I don't have much to show as far as a solution attempt goes, as I am stuck on how to proceed. I thought...

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