6 inches across
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6 inches across
43 linear feet. The diameter of the circle is the longest distance that you can have in the circle.
If you mean perimeter length of a 30 inch diameter circle, then it is 30*Pi or 94.248 inches (rounded to 3rd decimal).
how many linear feet in a 20 foot diameter
What do you mean? 40 inches = 40 inches.