The area of a circle with a diameter of 75 inches is: 4,418 square inches.
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Using 3.14 as Pi the area of circle is: 0.44156249999999997
radius = square root of (75/pi) = 4.886025119 diameter = 2*radius = 9.772050238 or 10 mm to the nearest integer
Area of the circle = pi*7.8752 = 194.8278319 square units Area of sector = 75/360 times 194.8278319 = 40.58913165 square units
Lateral surface area = 75.39822369 or about 75 square inches Total surface area = 89.53539063 or about 90 square inches
Area = pi*d2/4 = 4418 sq feet approx.