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The quotient between the circumference of a circle and its diameter is always the same and it is a constant denoted as π:
[tex]\pi=\frac{C}{D}[/tex]π is an irrational number and its first digits are:
[tex]3.141592653\ldots[/tex]Isolate C from the given relation and substitute D=1,400mi to find the circumference of Pluto:
[tex]\begin{gathered} C=\pi D \\ =(3.141592653\ldots)\times(1400mi) \\ =4398.229715\ldots mi \\ \approx4400mi \end{gathered}[/tex]Therefore, the circumference of Pluto is approximately 4,398 miles.