Diameters cannot be found from that linear measurement. A diameter is the length across the center of the circle. It can also be found by doubling the radius of a circle.
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A = pi * r2so:A = 3.14 * 82 = 200.96 square meters
If the diameter of a circle is 37.3 meters its area is: 1,093 m2
Diameter = Circumference / Pi Diameter = 16 / 3.14 Diameter = 5.095
A cylinder with a height of 20 meters and a diameter of 10 meters has a surface area of 785.4m2
A cylinder with a diameter of 7 meters and a height of 12 meters has a volume of 461.81 cubic meters.