The surface area of the pond is measured in square meters.
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If 75 feet is the circumference of the pond then its radius works out as 12 feet rounded to the nearest whole number and its surface area is pi*12^2 which is 144*pi square feet.
The answer depends on what characteristic you want to measure: its temperature, refractive index, circumference, depth, volume, etc.
9 Acres = 36,421.7 square meters. 4 feet = 1.2 meters. Area x length = volume; 36,421.7 x 1.2 = 43,706 cubic meters. Cubic meters is a volume, which can be converted to liters, 1 cubic meter is 1000 liters. So your pond has 43,706,000 Liters. 1 gallon is 3.78 liters, so divide by 3.78 and your pond has 11,545,903.7 Gallons.
$1,850
Volume = (surface area) x (depth) = 217,800 cubic feet = 1,629,257.1 gallons (rounded)