The equation for the surface area of a circle is Pi times the radius squared.
Pi x r^2 = Area of a circle
The radius is 1/2 the diameter therefore if d is the diameter;
Pi x (d/2)^2 = Area of a circle
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The area of a circle with a diameter of 9.4 m is: 69.4 m2
A diameter is a line, and has no area.A circle whose diameter is 8.5 has an area of 56.745. (rounded)
The diameter = sqrt (area*4/Pi) = 15.6353
Divide the area by pi (= 3.14159 approx) to get diameter.
Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter