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List of countries by total fertility rate
As of the 2021 census, the population of Russia was 147.2 million. [11] It is the most populous country in Europe, and the ninth-most populous country in the world, with a population density of 8.5 inhabitants per square kilometre (22 inhabitants/sq mi). [12]
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Ukraine - Wikipedia ... Ukraine
This article contains the number of confirmed COVID-19 deaths per population as of 31 August 2024, by country. It also has cumulative death totals by country. For these numbers over time see the tables, graphs, and maps at COVID-19 pandemic deaths and COVID-19 pandemic by country and territory.
Golden ratio - Wikipedia. A golden rectangle with long side a + b and short side a can be divided into two pieces: a similar golden rectangle (shaded red, right) with long side a and short side b and a square (shaded blue, left) with sides of length a. This illustrates the relationship a + b a = a b = φ.
The number π (/ paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.
