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In a triangle, any arbitrary side can be considered the base. The two endpoints of the base are called base vertices and the corresponding angles are called base angles. The third vertex opposite the base is called the apex. The extended base of a triangle (a particular case of an extended side) is the line that contains the base.
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.
Archimedes proved a formula for the area of a circle, according to which < <. [2] In Chinese mathematics , in the third century CE, Liu Hui found even more accurate approximations using a method similar to that of Archimedes, and in the fifth century Zu Chongzhi found π ≈ 355 / 113 ≈ 3.141593 {\displaystyle \pi \approx 355/113\approx 3. ...
The minor sector is shaded in green while the major sector is shaded white. A circular sector, also known as circle sector or disk sector or simply a sector (symbol: ⌔), is the portion of a disk (a closed region bounded by a circle) enclosed by two radii and an arc, with the smaller area being known as the minor sector and the larger being the major sector. [1]
A manzana is a unit of area used in Argentina and in many Central American countries, originally defined as 10,000 square varas in Spanish customary units. [1] In other Spanish-speaking regions, the term has the meaning of a city block. [2] Plan of the health area of the Universidad de Antioquia, Medellín, Colombia [a]
Total area is taken from the United Nations Statistics Division unless otherwise noted. [3] Land and water are taken from the Food and Agriculture Organization unless otherwise noted. [4] The CIA World Factbook is most often used when different UN departments disagree. [1] Other sources and details for each entry may be specified in the ...
The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures in reptiles, birds and mammals, including humans. [1]
Area A is exclusively administered by the Palestinian National Authority; Area B is administered by both the Palestinian Authority and Israel. Area A comprises approximately 18% of the total territory of the West Bank and Area B about 22% of the territory, together home to some 2.8 million Palestinians. [5]