The area of any circle is
(pi) x (radius)2
or
(1/4 pi) x (diameter)2 .
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It is: 12.25*pi square units
The radius of a circle is half of the diameter, so the radius of a circle with a diameter of 14in is 7in.
The area of a circle with a diameter of 9.4 m is: 69.4 m2
If the area of a circle is 8pi, its diameter is: 5.657 units.
Assuming a diameter of 5 inches.The area of this circle is: 19.63