What is the constant of variation in the circumference formula $C = 2pir$ ?

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Answer 1 · 2015-11-10T00:58:40

How does the formula for circumference relate to the formula for constant of variation: $y=kx$ ?

The constant of variation (k) for the circumference formula is:

$k=2pi$

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What is the constant of variation in the circumference formula C = 2pirC = 2pir?