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.
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the radius is half the diameter. radius is half of 11. Which is 5.5.
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 biggest chord is the diameter which is radius*2 and so three quarters of an inch.
Area of the circle = pi*5.52 = 95.033 square inches to 3 decimal places
The length around a circle is the circumference The length across a circle is the diameter