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  2. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    He also gave two other approximations of π: π ≈ 22 ⁄ 7 and π ≈ 355 ⁄ 113, which are not as accurate as his decimal result. The latter fraction is the best possible rational approximation of π using fewer than five decimal digits in the numerator and denominator. Zu Chongzhi's results surpass the accuracy reached in Hellenistic ...

  3. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    Visualization of powers of two from 1 to 1024 (2 0 to 2 10) as base-2 Dienes blocks. A power of two is a number of the form 2 n where n is an integer, that is, the result of exponentiation with number two as the base and integer n as the exponent.

  4. List of U.S. states and territories by African-American ...

    en.wikipedia.org/wiki/List_of_U.S._states_and...

    Considering only those who marked "black" and no other race in combination, as in the first table, the percentage was 12.4% in 2020, down from 12.6% in 2010. [1] Considering those who marked "black" and any other race in combination, as in the second table, the percentage increased from 13.6% to 14.2%.

  5. Results of the 2015 Canadian federal election - Wikipedia

    en.wikipedia.org/wiki/Results_of_the_2015...

    According to preliminary figures from Elections Canada, more than 68 per cent of eligible voters cast a ballot, or about 17,546,697 registered electors—a seven percentage point increase from the 2011 federal election, when turnout was just more than 61 per cent. [2]

  6. Demographics of the United States - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_the_United...

    A study by the Agency for Healthcare Research and Quality (AHRQ) found that more than half (51 percent) of live hospital births in 2008 and 2011 were male. [ 93 ] Per U.S. federal government data released in March 2011, births fell 4% from 2007 to 2009, the largest drop in the U.S. for any two-year period since the 1970s. [ 94 ]

  7. Demographics of Angola - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_Angola

    Demographics development according to the United Nations. According to the 2022 revision of the world factbook the total population was 34,795,287 in 2022. [7] The proportion of children below the age of 14 in 2020 was 47.83%, 49.87% was between 15 and 65 years of age, while 2.3% was 65 years or older.

  8. Demographics of the world - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_the_world

    The percentage shares of China, India and rest of South Asia of the world population have remained at similar levels for the last few thousand years of recorded history. [1] [2] The world's literacy rate has increased dramatically in the last 40 years, from 66.7% in 1979 to 86.3% today. [3] Lower literacy levels are mostly attributable to poverty.

  9. List of countries by literacy rate - Wikipedia

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

    This is an accepted version of this page This is the latest accepted revision, reviewed on 21 December 2024. This article needs to be updated. Please help update this article to reflect recent events or newly available information. (March 2022) World map of countries shaded according to the literacy rate for all people aged 15 and over This is a list of countries by literacy rate. The global ...