3,848.45 square meters.
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The area of a circle 4.6m in diameter is 16.62 square meters.
Area = pi*14.452 = 655.972 square m to 3 dp
D = 500m C = 314.16m A = 196,349.54m2
Calculate the radius (half the diameter), then use the formula area = pi x radius2. Alternately, you can use the formula area = (1/4) x pi x diameter2.
The circumference of any circle is (pi) x (diameter),and of course, the diameter is double the radius.