The area is 63.6 square metres, approx.
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whats the diameter to 9m
C = 56.549m
If a square has sides of the length of 9m, then the area is 81 m2, as to get area, you multiply one side by another one.
Area = pi*r2 = 254.5 sq metres
circumference = π x diameter = 9π m ~= 28.3 m