No. The area of a circle is 3.142 x radius x radius (radius is half the diameter).
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The area increases as the square of the radius (or diameter). So if you double the radius you * 4 (quadruple) the area. Treble the radius, you *9 the area.
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
Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter