Layers of crust with a fruit filling.
2006-08-09 07:45:36
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answer #1
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answered by Dirk Diggler 3
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Pi is a numerical constant that represents the ratio of a circle's circumference to its diameter on a flat plane surface. The value is the same regardless of the size of the circle. The decimal expansion of pi is a nonterminating, nonrepeating sequence of digits. For most calculations, the value can be taken as 3.14159. This means, for example, that a circle with a diameter of 10 centimeters, as measured on a flat surface, has a circumference of approximately 31.4159 centimeters.
The number pi is also the ratio of the diameter of a sphere to the length of any great circle (geodesic) on the sphere. So, for example, if the earth is considered to be a perfect sphere with a diameter of 8,000 miles, then the distance around the earth, as measured along the equator or along any great circle, is approximately 8,000 x 3.14159, or 25,133 miles.
Pi is an irrational number. It cannot be precisely defined as the ratio of any two whole numbers. Thus, its decimal expansion has no pattern and never ends. The first few hundred, thousand, million, or billion digits of pi can be calculated using a computer to add up huge initial sequences of the terms of an infinite sum known as a Fourier series.
2006-08-09 14:43:39
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answer #2
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answered by John 2
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By definition, pi is the ratio of the circumference of a circle to its diameter. Pi is always the same number, no matter which circle you use to compute it.
For the sake of usefulness people often need to approximate pi. For many purposes you can use 3.14159, which is really pretty good, but if you want a better approximation you can use a computer to get it. Here's pi to many more digits: 3.14159265358979323846.
The area of a circle is pi times the square of the length of the radius, or "pi r squared":
A = pi*r^2
2006-08-09 14:44:01
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answer #3
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answered by Style 3
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Pi is a magic number that you can determine diamter and circomfrence and even area of a circle with, as long as you have some information to begin with. It is also an amzing number because there is no pattern to what the next number is going to be, it goes on forever.
2006-08-09 14:47:37
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answer #4
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answered by Lady 5
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I think of it as a word for the number 3.14 since its a common number in a lot of equations
2006-08-09 14:47:21
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answer #5
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answered by kita 2
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and that's a number by which you need to multiply the diameter of a circle to get the length of that circle.
2006-08-09 14:44:12
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answer #6
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answered by Michael R 4
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its a pie
2006-08-09 14:44:09
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answer #7
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answered by sliver 3
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