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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.
Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics, most notably in Euclid's Elements. [4] Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions), until the 16th and 17th centuries, when algebra [a] and ...
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.
[11] [12] [13] Alongside Amazon, Apple, Meta, and Microsoft, Google's parent company, Alphabet Inc. is one of the five Big Tech companies. Google was founded on September 4, 1998, by American computer scientists Larry Page and Sergey Brin while they were PhD students at Stanford University in California .
The unemployment rate increased from 1.7% in June 2000 to 4.4% in December 2009. [165] It then decreased to 3.2% in 2014 and held steady for several years, before further dropping to 2.5% in 2018 and 2.3% in 2019; as of 2023 [update] it had reached a 20-year low of 2%. [ 166 ]
Hinduism (/ ˈ h ɪ n d u ˌ ɪ z əm /) [1] is an umbrella term [2] [3] [a] for a range of Indian religious and spiritual traditions (sampradayas) [4] [note 1] that are unified by adherence to the concept of dharma, a cosmic order maintained by its followers through rituals and righteous living, [5] [6] [7] [b] as first expounded in the Vedas.
Artificial intelligence (AI), in its broadest sense, is intelligence exhibited by machines, particularly computer systems.It is a field of research in computer science that develops and studies methods and software that enable machines to perceive their environment and use learning and intelligence to take actions that maximize their chances of achieving defined goals. [1]
It is estimated that there are between 200 billion [7] (2 × 10 11) to 2 trillion [8] galaxies in the observable universe. Most galaxies are 1,000 to 100,000 parsecs in diameter (approximately 3,000 to 300,000 light years ) and are separated by distances in the order of millions of parsecs (or megaparsecs).