Circumference will be 120 pi inches, ie 31 feet and very nearly 5 inches
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If the circle is 11 inch in diameter, then the length of the circle is 69.1 inches, however if the 11 inches is the circumference, then the length is 11 inches.
Radius is 3 times as large so area is 3*3 = 9 times as large.
If you mean perimeter length of a 30 inch diameter circle, then it is 30*Pi or 94.248 inches (rounded to 3rd decimal).
Using 3.14 as Pi the area of circle is: 113.03999999999999
The largest square that can fit inside a 36-inch diameter circle has its corners touching the circle. The diagonal of the square equals the diameter of the circle, which is 36 inches. Using the relationship between the side length (s) of the square and its diagonal (d) (where (d = s\sqrt{2})), the side length of the square is (s = \frac{36}{\sqrt{2}} \approx 25.45) inches. Thus, the side of the largest square that fits inside the circle is about 25.45 inches.