Use the formula for the area of a circle (area = pi x radius squared), replace what you know (in this case the area), and replace - in this case - for the radius.
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Radius: 110/2*pi = 17.51 rounded to two decimal places
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
The area of a circle of radius 21 is 1386
It is: 110/360*pi*12*12 = 44*pi square units