In geometry, the focus (pl. foci) is a special point used in describing conic sections. Geometry (Greek Î³ÎµÏ‰Î¼ÎµÏ„ÏÎ¯Î±; geo = earth, metria = measure) arose as the field of knowledge dealing with spatial relationships. ...
In mathematics, a conic section (or just conic) is a curved locus of points, fby intersecting a cone with a plane. ...
A conic section can be defined as the set of points whose distance to its focus is equal to the eccentricity times the distance to the corresponding directrix. Even in the case of two foci, the described set, applied on a single focusdirectrix combination, is the whole conic section. (This page refers to eccitricity in mathematics. ...
In mathematics, a conic section (or just conic) is a curved locus of points, formed by intersecting a cone with a plane. ...
Note that (noncircular) ellipses and hyperbolas each have a pair of foci. An ellipse can be described as the set of points for which the sum of the distances to the foci is constant, while a hyperbola is the set of points for which the absolute value of the difference of the distances to the foci is constant. In mathematics, an ellipse (from the Greek for absence) is a plane algebraic curve where the sum of the distances from any point on the curve to two fixed points is constant. ...
A graph of a hyperbola, where h = k = 0 and a = b = 2. ...
A graph of a hyperbola, where h = k = 0 and a = b = 2. ...
In the gravitational twobody problem, the orbits of the two bodies are described by conic sections with foci at the center of mass. Gravitation is the tendency of massive objects to accelerate towards each other. ...
In mechanics, the twobody problem is a special case of the nbody problem that admits a closed form solution. ...
It has been suggested that this article or section be merged with Center of gravity. ...
