How to solve
The equation f(x, y) = c for f = x² + y² is the circle of radius √c centered at the origin.
Steps
- If you know c, radius is √c.
- If you see radius r, then c = r².
Example
x² + y² = 4
- r = 2.
- Level value c = 4.
Answer: 2 or 4 depending on the prompt
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