SOLUTION: do the formulas for the area of a circle and the circumfrence of a circle represent linear relationships?

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Question 18682: do the formulas for the area of a circle and the circumfrence of a circle represent linear relationships?
Answer by astromathman(21) About Me  (Show Source):
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A linear relationship is one where the variables are, at most, to the first power. The Circumference of a circle meets this criterion: C=2%2Api%2Ar. The area, on the other hand, has an r%5E2, so it is not a linear relationship. It is a quadratic relationship.