sphere

     

A sphere (from Greek σφαίρα - sphaira, "globe, ball,") is a symmetrical geometrical object. In non-mathematical usage, the term is use to refer either to a round ball or to its two-dimensional surface. In mathematics, a sphere is the set of all points in three-dimensional space (R3) which are at distance r from a fixed point of that space, where r is a positive real number called the radius of the sphere. Thus, in three dimensions, a mathematical sphere is considered to be a two-dimensional spherical surface embedded in three-dimensional space, rather than the volume contained within it (which mathematicians would instead describe as a ball). The fixed point is called the center or centre, and is not part of the sphere itself. The special case of r = 1 is called a unit sphere.

Trivia about sphere

  • The diameter of one of these 3-dimensional figures is twice the radius
  • The formula for the surface area of this is the formula for the area of a circle, multiplied by 4
  • This Michael Crichton novel was shaped into a 1998 Warner Bros. film by Barry Levinson
  • Its surface area can be determined by using 4 pi r2
  • Trig comes into play in figuring out distances between points on one of these math shapes, like the Earth
  • The name of this solid comes from a Greek word meaning "ball"
  • A round solid geometric figure, or a field of knowledge
  • Cezanne said, "Treat nature in terms of the cylinder," this shape & "the cone, all in perspective"
  • It's the 3-dimensional figure that is a set of points all equidistant from the center point