The formula for area of a circle is Pi x r (squared), A = Pi(rxr). So since the diameter is 30 you divide it by two and get 15 and then square it and multiply it by pi and get 706.86 meters.
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The area of a circle with the diameter of 3m is 7.069 m2
The area of a circle with diameter of 4.9 is 75.43 units2
The diameter of a circle whose area is 200.96 is: 16
The area of a circle with a diameter of 6.5 is: 33.18 square units.
A circle with an area of 200 acres has a diameter of: 3,331 feet.