The answer depends on what the 11 m refers to radius, diameter or something else.
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Circumference of a circle is pi multiplied by the diameter. If the diameter of the circle is 11 ft, the circumference is: 3.14 x 11 ft = 34.54 ft
Circumference of the circle: 2*pi*8 = 16*pi m
The answer depends on what 11 m refers to. its radius or its diameter or even some other measure.
Circumference = 18.8 mArea = 28.3 m^2.
Radius of circle: 157/2pi = 25 m rounded