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Q: What is the subset of 8.1 pi?
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What is the subset of pi?

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


What is the radius if the area of the garden is 81 times pi ft?

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


How do you find the radius of a circle if area is 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


What is Pi x 81?

3.14 x 81 = 254.34


What is the circumference of a circle with an area of 81?

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)


If the diameter of a circle is 18 what is the area with pi?

Area of circle: 81*pi square units


Which subset of the real number does pi belong?

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


Ratio of circumference of a circle to its diameter?

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


Which subset does not contain 0?

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


What is 81 times pi?

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


What is the circumference of a circle if the area is 81 pi square feet?

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


What is 81 divided by pi?

25.7831 (to 4 dp)


What did Egyptians use Pi for?

The Egyptians used 256 divided with 81 to calculate pi.


What is the area of a circle that has a radius of 9cm?

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


What is pi times eighty one?

3.141592653589793 * 81 = 254.469


What is the number sequence called with 9 in the Pi sequence?

81


What value of pi did the Egyptians obtain?

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


What is the volume of a cylinder with a radius of 9 cm and a height of 8 cm?

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)


What is pi r squared times three to the fourth power?

(pi) R2 x 34 = 81 pi R2


What is the area between two circles with the same centre and of radii 5cm and 9cm respectively?

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


What is the volume of a cylinder that has a radius is 9 in and height 48 in?

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


What is the difference in area that is 18 inches in diameter and 9.6 inches in diameter?

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.


What is the area of a circle with the diameter of 18?

81 pi square units


What is the diameter of a circle with a circumference of 81m?

Diameter = 81/pi = 25.78310078 m


What value of pi did the Egyptians obtain during 2000 BC?

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