Diameter of the circle: 21/pi = 6.685 miles rounded to 3 decimal places
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The circumference of a circle that has a diameter of 21 is about 65.97
The circumference of a 21 circle is: 65.97 (diameter x pi = circumference).
The diameter of Earth at its equator is 12,756 km and its circumference is about 40,075 km.
Circumference = 21*pi
The diameter is approximately 6.7