Using 3.14 as Pi the area of circle is: 6358.500000000001
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You wouild square the 90 and multiply that product by pi. It is approximately 25,447 square mm (or 254.47 square cm).
90mm / 2 = 45 mm
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