Open Middle®
Directions:
Using any integers, fill in the blanks to Fill in the blanks with integers so that:
- The equation’s graph is a circle.
- The circle has the biggest area
- The circle is completely inside the first quadrant
- The circle’s radius is a whole number 1 through 9.
Hint
When graphing an equation of a circle, which form of the equation is the most helpful?
Answer
One of the possibilities is 
Another possibility is 
Source: Nanette Johnson
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?