Diameter = 30/pi inches
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If the circumference of a circle is 30 cm its diameter is: 9.549 cm
The circumference of a 30-foot diameter circle is: 94.248 feet.
circumference = 30*pi feet
Its diameter in feet is: 30/pi
The diameter of a circle is the distance across the circle passing through its center. In this case, the diameter of a 30-inch circle would be 30 inches. It is important to note that the diameter is always twice the length of the radius, which is the distance from the center to any point on the circle's edge.