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
Well, honey, the diameter of a circle is the distance across the center, so for a 30-inch circle, the diameter would be 30 inches. I mean, it's right there in the question, darling. So, yeah, the diameter of a 30-inch circle is 30 inches.