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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.
For example, in mathematics, "or" means "one, the other or both", while, in common language, it is either ambiguous or means "one or the other but not both" (in mathematics, the latter is called "exclusive or"). Finally, many mathematical terms are common words that are used with a completely different meaning. [100]
In 1980, one of the first handheld video game systems, the Game & Watch, was created by Yokoi from the technology used in portable calculators. [3] [38] It became one of Nintendo's most successful products, with over 43.4 million units sold worldwide during its production period, and for which 59 games were made in total. [50]
By 2012, Android tablet adoption had increased. 52% of tablet owners owned an iPad, while 51% owned an Android-powered tablet (percentages do not add up to 100% because some tablet owners own more than one type). [235] By end of 2013, Android's market share rose to 61.9%, followed by iOS at 36%. [236]
For example, the Environmental Protection Agency estimates that coal kills 30,000 people a year, [268] as a result of its environmental impact, while 60 people died in the Chernobyl disaster. [269] A real world example of impact provided by proponents is the 650,000 ton increase in carbon emissions in the two months following the closure of the ...
One in a million has planets around it. Only one in a million million has the right combination of chemicals, temperature, water, days and nights to support planetary life as we know it. This calculation arrives at the estimated figure of 100 million worlds where life has been forged by evolution."
A basic box cooker consists of an insulated container with a transparent lid. These cookers can be used effectively with partially overcast skies and will typically reach temperatures of 50–100 °C (100–200 °F). [29] [30] Concentrating solar cookers use reflectors to concentrate solar energy onto a cooking container.