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  2. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  3. Pi Day - Wikipedia

    en.wikipedia.org/wiki/Pi_Day

    Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of π, and was first celebrated in the United States. [2] [3] It was founded in 1988 by Larry Shaw, an employee of a science museum in San Francisco, the Exploratorium. Celebrations often involve eating pie or holding pi recitation competitions.

  4. Indiana pi bill - Wikipedia

    en.wikipedia.org/wiki/Indiana_Pi_Bill

    An 1897 political cartoon mocking the Indiana pi bill. In 1894, Indiana physician Edward J. Goodwin (c. 1825 – 1902 [2]), also called "Edwin Goodwin" by some sources, [3] believed that he had discovered a way of squaring the circle. [4]

  5. Leibniz formula for π - Wikipedia

    en.wikipedia.org/wiki/Leibniz_formula_for_π

    In mathematics, the Leibniz formula for π, named after Gottfried Wilhelm Leibniz, states that = + + = = +,. an alternating series.. It is sometimes called the Madhava–Leibniz series as it was first discovered by the Indian mathematician Madhava of Sangamagrama or his followers in the 14th–15th century (see Madhava series), [1] and was later independently rediscovered by James Gregory in ...

  6. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Area of a cloth 4.5m × 2.5m = 11.25m 2; 4 ⁠ 1 / 2 ⁠ × 2 ⁠ 1 / 2 ⁠ = 11 ⁠ 1 / 4 ⁠ Multiplication (often denoted by the cross symbol, ×, by the mid-line dot operator, ·, by juxtaposition, or, on computers, by an asterisk, *) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition ...

  7. 3.14 (EP) - Wikipedia

    en.wikipedia.org/wiki/3.14_(EP)

    In promotion of his EP, Pvrx released The Formula, a short film in promotion of 3.14.The documentary contained appearances from Rexdale natives Kardinal Offishall and Jelleestone. [9]

  8. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    In mathematics, the notion of number has been extended over the centuries to include zero (0), [3] negative numbers, [4] rational numbers such as one half (), real numbers such as the square root of 2 and π, [5] and complex numbers [6] which extend the real numbers with a square root of −1 (and its combinations with real numbers by adding or ...

  9. AP Precalculus - Wikipedia

    en.wikipedia.org/wiki/AP_Precalculus

    The 2025 AP Precalculus exam is set to take place on Tuesday, May 13, 2025 at 8AM local time. [6] Score distribution. Score 2024 [7] 5 25% 4 24% 3 26% 2 15% 1