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 lineal inch of a 90-degree circle, also known as the circumference, can be calculated using the formula: Circumference = pi * diameter. In this case, the lineal inch will be equal to pi times the diameter of the circle.