What do you mean? 40 inches = 40 inches.
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6 inches across
If you mean perimeter length of a 30 inch diameter circle, then it is 30*Pi or 94.248 inches (rounded to 3rd decimal).
6 inches across
63. The inch is a linear measurement, so the adjective is unnecessary.
The area of a 3-inch diameter circle is about 7.068 square inches.