Area = pi*252 = 1963.495 square mm to 3 decimal places
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Area = pi*(diameter/2)2 = pi*252 = 1963.50 mm2
The radius is 1/2 the diameter. In other words, just divide the diameter by 2.
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