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Because of the radius of the circle
The circumference of a circle if the radius is 27 inches is: about 169.6 inches. (you can do this type of calculation for other circles using this formula: r x 2 x Pi = circumference).
any circles circumference divided by its diameter will equal pi, or 3.14159 approximately
Circumference of a circle is 2 x Pi x the radius
Pi (3.14) times the radius of a circle squared, equals the circumference of a circle.