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  2. Ratio - Wikipedia

    en.wikipedia.org/wiki/Ratio

    The ratio of width to height of standard-definition television. In mathematics, a ratio (/ ˈ r eɪ ʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).

  3. Geometric progression - Wikipedia

    en.wikipedia.org/wiki/Geometric_progression

    For example, the sequence 2, 6, 18, 54, ... is a geometric progression with a common ratio of 3. Similarly 10, 5, 2.5, 1.25, ... is a geometric sequence with a common ratio of 1/2. Examples of a geometric sequence are powers r k of a fixed non-zero number r, such as 2 k and 3 k. The general form of a geometric sequence is

  4. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. Expressed algebraically, for quantities ⁠ a {\displaystyle a} ⁠ and ⁠ b {\displaystyle b} ⁠ with ⁠ a > b > 0 {\displaystyle a>b>0} ⁠ , ⁠ a {\displaystyle a} ⁠ is in a golden ratio to ...

  5. Formula - Wikipedia

    en.wikipedia.org/wiki/Formula

    An example is boron carbide, whose formula of CB n is a variable non-whole number ratio, with n ranging from over 4 to more than 6.5. When the chemical compound of the formula consists of simple molecules , chemical formulas often employ ways to suggest the structure of the molecule.

  6. Compactness measure - Wikipedia

    en.wikipedia.org/wiki/Compactness_measure

    A common compactness measure is the isoperimetric quotient, the ratio of the area of the shape to the area of a circle (the most compact shape) having the same perimeter. . In the plane, this is equivalent to the Polsby–Popper t

  7. Silver ratio - Wikipedia

    en.wikipedia.org/wiki/Silver_ratio

    In mathematics, the silver ratio is a geometrical proportion close to 70/29. Its exact value is 1 + √2, the positive solution of the equation x 2 = 2 x + 1. The name silver ratio results from analogy with the golden ratio , the positive solution of the equation x 2 = x + 1.

  8. Ratio distribution - Wikipedia

    en.wikipedia.org/wiki/Ratio_distribution

    The diagram shows a separable bivariate distribution , (,) = () which has support in the positive quadrant , > and we wish to find the pdf of the ratio = /. The hatched volume above the line y = x / R {\displaystyle y=x/R} represents the cumulative distribution of the function f x , y ( x , y ) {\displaystyle f_{x,y}(x,y)} multiplied with the ...

  9. Section formula - Wikipedia

    en.wikipedia.org/wiki/Section_formula

    In coordinate geometry, the Section formula is a formula used to find the ratio in which a line segment is divided by a point internally or externally. [1] It is used to find out the centroid, incenter and excenters of a triangle. In physics, it is used to find the center of mass of systems, equilibrium points, etc. [2] [3] [4] [5]

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