The area of a circle with a radius of 3 feet is: 28.27 square feet.
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Radius of the circle is the square root of (123/pi) = 6.257 feet to 3 decimal places
You don't mention whether the 4 feet is the circumference, diameter or radius. The area of a circle is pi times the radius squared. If 4 feet is the circumference, the area is about 1.3 feet squared. If 4 feet is the diameter, the area is about 12.6 feet squared. If 4 feet is the radius, the area is about 50.3 feet squared.
A circle with a radius of 3 cm has an area of 28.27 square cm.
The radius of the circle is 4 .5 ft. Where r is the radius and Pi is the mathematical constant: r2*Pi = area of a circle. Therefore the area of your circle must be 7.069 ft2
Using 3.14 as Pi the area of circle is: 7.0649999999999995