It's the relationship between the diameter and the circunference of a circle, but when did it get its name?
125273
The modern symbol for Pi was first used in our modern sense in 1706 by William Jones. Pi was chosen to represent the number 3.141592... because the letter [pi] in Greek, pronounced like our letter 'p', stands for 'perimeter'.\n\nI'd like to pretend I already knew this, but actually I found it at
363878
Encyclopedias. The term is not Latin, but actually comes from the Greek εγκύκλιος παιδεία (enkuklios paideia), literally "in a circle of instruction"\n\n--------------------------\n\nHere's a fuller definition of the term for you if you're interested, and also for the benefit of user Old Lady below (since she/he doesn't allow email contact): \n\nThe word comes from the Classical Greek ἐγκύκλιος παιδεία (pron. enkyklos paideia), literally 'the things of boys/child in a circle', meaning "a general knowledge." Though the notion of a compendium of knowledge dates back thousands of years, the term was first used in the title of a book in 1541 by Joachimus Fortius Ringelbergius in the title page of his Lucubrationes vel potius absolutissima kyklopaideia (Basel, 1541). It was first used as a noun by the encyclopedist Pavao Skalic in the title of his book Encyclopaedia seu orbis disciplinarum tam sacrarum quam prophanarum epistemon ("Encyclopaedia, or Knowledge of the World of Disciplines") (Basel, 1559).
659589
In Euclidean plane geometry, π(Pi) is defined either as the ratio of a circle's circumference to its diameter, or as the ratio of a circle's area to the area of a square whose side is the radius. π may be defined in many other ways, for example as the smallest positive x for which sin(x) = 0. See other formulas below. All these definitions are equivalent.\n\nArea of Circle = Pi.(Radius)^2\nPerimeter of Circle (Circumference)=2.Pi.Radius.\nYes .. it has someting to do with Statistics :\n\nIn probability and statistics, there are many distributions whose formulæ contain π, including:\n\nprobability density function (pdf) for the normal distribution with mean μ and standard deviation σ : \nhttp://en.wikipedia.org/wiki/Pi
243532
The circumference of the circle with radius of 1 m:\nd = 2*pi*r = 6.28 meters.\n\nThe time t = 1.35 seconds\n\nYou get the velocity by dividing the travelled distance by the time interval:\nv = d/t = 4.65 m/s
38582
pi is a greek word taht denotes 22/7 and pi is not exactly equal to 3.14:Actually 4 every possible circle in the world, when the circumference is divided by the same circle's diameter(d) the result is constant and equal to 22/7, which is a universal constant.It is from this basic idea that the circumference(c) of any circle C=pi*d evolved
66623
Circular. Imagine that you have a weight on a string, and you whirl it around over your head. That's the basic gist of it. However, in real life, orbits are elliptical.
304680
The length of one side of the rectangle can be related to the Circumference of the circle.\nTo get the perimeter of a circle, called the circumference of the circle, one simply has to multiply 2 times pi (about 3.14) times the radius of the particular circle. \nThe circumference of a circle can be calculated from its diameter using the formula:\nc = πd\nOr, substituting the radius for the diameter:\nc = 2πr\nWhere r is the radius and d is the diameter of the circle, and π (the Greek letter pi) is the constant 3.141 592 653 589 793...
70851
TANGENT comes from the Latin TANGENS, the present participle of TANGERE, \n"to touch." In other words, it means "touching." It was originally \napplied to the line segment AB in the figure: the segment of the \ntangent to the circle at A that is cut off by the extension of OB. The \nratio of the tangent AB to the radius of the circle, OA, is the \nTANGENT of angle AOB.
35787
I´m guessing you want to know the difference in meaning, since you already have the values.\n\nThe radius is the distance measured from the center to the edge of a circle. Imagin Earth as an orange cut in half and put back together. The cut line would be the Equator. Now open the orange and face the inside of the orange and you´ll see a white circle. The distance from the center of the orange to the edge (or white stuff) is the radius.\nThe circumference (or perimeter) is the length of one full lap around that circle.
582368
Perimeter of a circle = 2 *pi* radius or = pi *diameter\n\nFrom your picture the diameter of that semicircle = 8 \n\nso the perimeter of the circle = 8 * pi\n\nperimeter of semicircle (half circle) = 8*pi / 2 = 4* pi\n\nAlso, you can find the radius of the circle = diameter/2 = 8/2= 4\n\nThe Width of that rectangular = 1+ radius = 1+4 = 5\n\nThe two bottom short edges = the length of the rectangular - diameter of the semicircle = 10-8=2\n \nThe perimeter of the shaded area = Length of the rectangular + 2 * width  +  two bottom short edges + perimeter of the  semicircle = 10+2*5+2+4*pi=22 + 4* pi\n\nthe answer is a.\n\nHave fun !
281346
Area of the circle = pi r^2\nArea of the square = x^2\n\nThese are equal so x^2 = pi r^2\nTake the sqrt of both sides:\nx = sqrt(pi) r\nx = 1.77245385 r\n\nBut the diameter is twice the radius\nd = 2 r\n\nAs you can see d > x  because 2 > 1.77245385\n\nSo the diameter of a circle (d) would be larger than the side (x) of square with the same area.\n\nThe answer is:  The diameter of the circle
504959
Correlation! (Maybe... well the 6th letter is L at least).\n\nCorrelation basically describes the strength and direction of the (linear only) relationship between two variables or sets of observations. \n\nIt's a number between -1 and 1, and is denoted by 'r' or the Greek letter 'rho' (it looks like a 'p').  E.g. r = 0.87 \n\nI hope that's the kind of statistical symbols the crossword clue is referring to. \n\nGood luck with the crossword!
565755
well nice question\n\nThe largest circle would be one that had its centre point in the centre of a white square and it runs through the black squares around it. It starts through the corner of one black square and goes through the square and continues through to the next black square joined by the corners.  \n\nThe diameter of the circle would be  d = SQRT(5^2+5^2)\n         Where SQRT means square root of (   )\n                and ' ^ ' means to the power of.\nd= 7.07 cm\n\nTherefore the circumference =(pi)*(d)\n\nCirc. = 22.21\nHope it helps
295736
It's spelled "pi" and it's used in trigonometry because it's how you measure a circle in radians. Radians is a better way to measure angles - pi is equivalent to 180 degrees, and 2pi is equivalent to 360 degrees.
539860
L = 8pi G rho/c^4 is the definition of the cosmo constant L (1/m^2); where c = light speed and rho is the energy density of the known universe in a vacuum.\n\nF = GmM/r^2 is the equation for the attraction force F between two masses m and M, r distance apart.\n\nL was created by Einstein to make his equations come out right.  By that, he meant the universe should be spherical (not flat or saddle shaped).  His original results showed a flat universe, and he just "knew" that was wrong; so on came L to fix the shape problem.\n\nF was the result of experiments by Newton.  Through observation, he found that the attractive force between two bodies was proportional to the inverse square of the distance between them and to the product of the magnitudes of the two masses.  That is, F varies as (~) (mV/r^2).  \n\nWhenever there is a proportionality, as in F ~ mM/r^2, there has to be a constant of proportionality.  In this case Newton called it G; so that F ~ mM/r^2 becomes F = GmM/r^2 when the constant is inserted.\n\nThe G in both equations is the same constant.  But Sir Newton came upon it long before Einstein found it could be used in his equations and the calculation of L.  So there is no way that Newton (1642-1727) could know about Einstein's (1879-1955) use of it much later.
95990
The symbol p is called pi and is approximately equal to 22/7 or 3.141592654 , most high school teachers use it to two decimal places as 3.14\np is the ratio between the circumference and the diameter of a circle ..i.e \np = (circumference / diameter ).\nInterestingly the value of p is the same for any circle ... \n\nArea of circle = p x ( radius x radius ) = p radius2\n\nif the Radius = R \nthen \nArea of circle = pR2 = p x R x R \n\nHere's an example:\nFind the area of the circle with radius 10 cm ..use p as 3.14\nAnswer\nHere we have :\nRadius = 10 cm\np = 3.14\n\nUsing the formula Area of circle = p radius2 = p x radius x radius \n\nreplacing radius with 10 cm and p with 3.14 in above formula we have\n\nArea of circle = p radius2 = p x radius x radius = 3.14 x 10cm x 10cm = 3.14 x 100 cm2 = 314 cm2
291264
Radians are based on pi.  A radian is equivalent to 1/(2pi).  Because it is just a ratio of another constant, it isn't based on a physical standard unlike feet, meters, etc.\n\nIt's just like degrees.  A degree is 1/360th of a complete circle, but nobody needs to define 360 with a physical object.  We all know what 360 is.  Similarly we know what 2pi is (it's the circumference of a unit circle).