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Q: What is the subset of 8.1 pi?

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pi is a single number , not a set. Since it is not a set, it cannot have a subset.

The radius is 9 feet because pi*92 = 81*pi

Divide the 81 pi by pi, then square root it. (Use the formula for area of circle, which gives 81pi=pi*radius squared, but rearrange to find the radius). i.e. it's the square root of 81

3.14 x 81 = 254.34

In every circle . . .Area = (pi) x (radius)2Diameter = 2 x radiusCircumference = (pi) x diameterIn this circle, Area = (pi) R2 = 81R2 = 81/piR = sqrt( 81/pi )Diameter = 2 x sqrt( 81/pi )Circumference = (pi) x 2 x sqrt( 81/pi ) = 2 x sqrt( 81 pi ) = 18 sqrt(pi) = 31.9042 (rounded)

Area of circle: 81*pi square units

It belongs to any subset which contains it. For example,the interval (3, 4){pi}{1, pi, 3/7}{27, sqrt(7), pi}

The ratio is pi, a transcendental number, which is a subset of irrational numbers. pi is approximately equal to 3.14159

Any collection or set (or subset) that does not contain 0. For example {3, pi, -37.6, sqrt(98), blue, dog, safuggff}

81 x 355/113 = 254.47 to 2 places of decimals

If: pi*radius2 = 81*pi sq ft Then: radius = 9 feet Circumference = 2*pi*9 = 56.549 feet rounded to 3 decimal places

25.7831 (to 4 dp)

The Egyptians used 256 divided with 81 to calculate pi.

Area: pi9^2 = 81pi or 254.469 square cm rounded

3.141592653589793 * 81 = 254.469

81

At around 1900 B.C., Egyptians estimated the value of pi to be 256 / 81 .

648pi. (pi = 3.14159...)Area of a circle = (pi) x (radius squared)= (pi)(9 squared) = (pi)81.Area of a cylinder = area of circle x height.= (pi)81 x 8= 648(pi)

(pi) R2 x 34 = 81 pi R2

It is pi*(92 - 52) = pi*(81 - 25) = pi*56 = 175.93 cm2

V=Pi*r2*h V=Pi*81*48=3888*Pi ~= 12214.51 in3

Area of circle with 18 inch diameter = pi*(18/2)2 = 81*pi sq inches Area of circle with 9.6 inch diameter = pi*(9.6/2)2 = 23.04*pi sq inches Difference = (81 - 23.04)*pi = 182.09 sq inches.

81 pi square units

Diameter = 81/pi = 25.78310078 m

At around 1900 B.C., Egyptians estimated the value of pi to be 256/81.