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  2. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    The Babylonians were aware that this was an approximation, and one Old Babylonian mathematical tablet excavated near Susa in 1936 (dated to between the 19th and 17th centuries BCE) gives a better approximation of π as 25 ⁄ 8 = 3.125, about 0.528% below the exact value. [8] [9] [10] [11]

  3. Ancient drachma - Wikipedia

    en.wikipedia.org/wiki/Ancient_drachma

    Fractions and multiples of the drachma were minted by many states, ... Using a labor-equivalent calculation, ... It was divided into six obols of 0.72 grams, which ...

  4. Rule of 72 - Wikipedia

    en.wikipedia.org/wiki/Rule_of_72

    To estimate the number of periods required to double an original investment, divide the most convenient "rule-quantity" by the expected growth rate, expressed as a percentage. For instance, if you were to invest $100 with compounding interest at a rate of 9% per annum, the rule of 72 gives 72/9 = 8 years required for the investment to be worth ...

  5. Cronbach's alpha - Wikipedia

    en.wikipedia.org/wiki/Cronbach's_alpha

    If a criterion means a cutoff point, it is important whether or not it is met, but it is unimportant how much it is over or under. He did not mean that it should be strictly 0.8 when referring to the criteria of 0.8. If the reliability has a value near 0.8 (e.g., 0.78), it can be considered that his recommendation has been met. [34]

  6. Gini coefficient - Wikipedia

    en.wikipedia.org/wiki/Gini_coefficient

    [7] [8] However, this figure drops to 0.52 after social assistance is taken into account and drops again to 0.47 after taxation. [9] Slovakia has the lowest Gini coefficient, with a Gini coefficient of 0.232. [10] Various sources have estimated the Gini coefficient of the global income in 2005 to be between 0.61 and 0.68. [11] [12]

  7. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    The physical group size equivalent to m minutes of arc can be calculated as follows: group size = tan(⁠ m / 60 ⁠) × distance. In the example previously given, for 1 minute of arc, and substituting 3,600 inches for 100 yards, 3,600 tan(⁠ 1 / 60 ⁠) ≈ 1.047 inches. In metric units 1 MOA at 100 metres ≈ 2.908 centimetres.

  8. Joule - Wikipedia

    en.wikipedia.org/wiki/Joule

    The joule (/ dʒ uː l / JOOL, or / dʒ aʊ l / JOWL; symbol: J) is the unit of energy in the International System of Units (SI). [1] In terms of SI base units, one joule corresponds to one kilogram-square metre per square second (1 J = 1 kg⋅m 2 ⋅s −2).

  9. Angle - Wikipedia

    en.wikipedia.org/wiki/Angle

    It equals 6°, so a whole turn was divided into 60 hexacontades. pechus: 144 to 180: 2° to 2°30′ The pechus was a Babylonian unit equal to about 2° or ⁠2 + 1 / 2 ⁠ °. diameter part: ≈376.991: ≈0.95493° The diameter part (occasionally used in Islamic mathematics) is ⁠ 1 / 60 ⁠ radian. One "diameter part" is approximately 0. ...