Equation of the Biggest Circle


Fill in the blanks with integers (including negatives) that meet the following requirements:

  1. The equation’s graph is a circle.
  2. The circle has the biggest area
  3. The circle is completely inside the first quadrant
  4. The circle’s radius is a whole number 1 through 9.



When graphing an equation of a circle, which form of the equation is the most helpful?



One of the possibilities is

Another possibility is

Source: Nanette Johnson

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One comment

  1. I’m not sure I understand this one. By completely inside, are you saying it cannot touch the axis and are you not allowed to use numbers twice?

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