Definition of Sphere: A sphere is a three-dimensional geometric shape that is perfectly symmetrical around its centre, with all points on the surface equidistant from the centre point. This round shape is often compared to a ball or globe. In mathematics, a sphere is defined as the set of points in three-dimensional space that are all at the same distance (the radius) from a given point (the centre). Beyond geometry, the term ‘sphere’ is also used metaphorically to refer to an area of activity, interest, or expertise (e.g., the sphere of politics).
Etymology and Origin: The word ‘sphere’ comes from the Greek word ‘sphaira’, meaning ‘globe’ or ‘ball’. Its use in English dates back to the 14th century. The concept of the sphere has been fundamental in mathematics and astronomy since ancient times, used to describe celestial bodies like stars and planets, and in various theories and models of the universe.
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