Remember
A = pi r^2
Hence
3000 = pi r^(2)
r^(2) = 3000 / pi ( =3.14) = 954.92965... sq.ft.
r = sqrt(954.92965... ) = 30.90193616 ft.
Now remember the diamter(d) is twice the radius(r)
d = 2r
Hence d = 2(30.90191616...) = 61.80387232... ft.
d =~= 61.8 ft.
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The diameter is twice the square root of (1000/pi) feet.
2.5 x 2.5 x 3.14 = 19.625 sqft
The area of a circle is calculated using the formula A = πr^2, where A is the area and r is the radius of the circle. Since the diameter of the circle is 12 inches, the radius would be half of that, which is 6 inches. Converting inches to feet (1 foot = 12 inches), the radius would be 0.5 feet. Plugging this into the formula, the area of a 12-inch circle would be approximately 0.785 square feet.
7850 sq ft. Formula is pi x R squared. Diameter of 100 means Radius (r) is 50. 50 squared (multiplied by itself) is 25000. Multiply THAT by the value of pi- or 3.14, and you get 7850 sq ft.
area of full circle = 400 sq. ft. if area = pi * radius2 then radius = square root ( area / pi ) = 11.284 radius (approx). = 22.568 diameter (approx).