If a point moves in a plane such that its distance from a fixed point bears a constant ratio to its perpendicular distance from a fixed straight line then the path described by the moving point is called a conic. In other words, if *S* is a fixed point, *l* is a fixed straight line and *P* is a moving point and *PM* is the perpendicular distance from *P* on *l*, such that constant, then the locus of *P* is called a conic. This constant is called the eccentricity of the conic and is denoted by *e*.

If *e* = 1, the conic is called ...

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