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If you mean perimeter length of a 30 inch diameter circle, then it is 30*Pi or 94.248 inches (rounded to 3rd decimal).
The area of a 3-inch diameter circle is about 7.068 square inches.
A circle with an 8-inch diameter has a perimeter of 25.1 inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The area of a circle with an 8 inch diameter is approximately 50.27 square inches.