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  2. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    The quantity 206 265 ″ is approximately equal to the number of arcseconds in a circle (1 296 000 ″), divided by 2π, or, the number of arcseconds in 1 radian. The exact formula is = ⁡ (″) and the above approximation follows when tan X is replaced by X.

  3. Automobile drag coefficient - Wikipedia

    en.wikipedia.org/wiki/Automobile_drag_coefficient

    The product of drag coefficient and area – drag area – is represented as CdA (or C x A), a multiplication of Cd value by area. The term drag area derives from aerodynamics , where it is the product of some reference area (such as cross-sectional area, total surface area, or similar) and the drag coefficient.

  4. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    The first use of an equals sign, equivalent to 14x+15=71 in modern notation.From The Whetstone of Witte (1557) by Robert Recorde. Recorde's introduction of "=" Before the 16th century, there was no common symbol for equality, and equality was usually expressed with a word, such as aequales, aequantur, esgale, faciunt, ghelijck, or gleich, and sometimes by the abbreviated form aeq, or simply æ ...

  5. List of countries by government budget - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    Global map of total central government revenues, as share of GDP, 2022 [1] Global map of total central government expenditures, as share of GDP, 2022 [2]. This is the list of countries by government budget.

  6. List of countries by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_life...

    This list of countries by life expectancy provides a comprehensive list of countries alongside their respective life expectancy figures. The data is differentiated by sex, presenting life expectancies for males, females, and a combined average.

  7. Contract bridge probabilities - Wikipedia

    en.wikipedia.org/wiki/Contract_bridge_probabilities

    Suppose East is known to have 7 spades from the bidding and after seeing dummy you deduce West to hold 2 spades; then if your two lines of play are to hope either for diamonds 5-3 or clubs 4-2, the a priori probabilities are 47% and 48% respectively but (,,,) % and (,,,) % so now the club line is significantly better than the diamond line.

  8. List of countries by trade-to-GDP ratio - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_trade...

    The following table provides information on exports [2] and imports [3] of goods and services, based on the data published by World Bank, trade openness index, calculated as their sum, and the ratio between exports and imports. Sorting is alphabetical by country code, according to ISO 3166-1 alpha-3.

  9. List of European countries by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_European_countries...

    Estimation of the World Bank Group for 2022. [2] [3] [4] The data is filtered according to the list of countries in Europe.In the World Bank Group list and, accordingly, in this list, there are no mini-states with a population of several tens of thousands of people (Andorra, Monaco, San Marino, Vatican City).