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We know that circumference (C) = pi* diameter (d). If you were given list of d and C and were asked to perform linest to estimate the value of pi, what would be X and Y variables for linest. Note: looking at the equation C = pi * d we can say that slope will give the value of pi. CX x = 1/C and Y = d X=1/d and Y = C X=dand Y = C

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