A conic is the locus of a point which moves in a plane, so that its distance from a fixed point bears a constant ratio to its distance from a fixed line not containing the fixed point.

**Conics**

A conic is the locus of a point which moves in a plane, so that
its distance from a fixed point bears a constant ratio to its distance from a
fixed line not containing the fixed point.

The fixed point is called **focus, **the fixed line is called **directrix **and the constant ratio
is called **eccentricity**, which is denoted by *e.*

(i) If this constant *e *= 1 then the
conic is called a parabola

(ii) If this constant *e *< 1 then the
conic is called a ellipse

(iii) If this constant *e *> 1 then
the conic is called a hyperbola

Tags : Definition , 12th Mathematics : UNIT 5 : Two Dimensional Analytical Geometry II

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12th Mathematics : UNIT 5 : Two Dimensional Analytical Geometry II : Conics | Definition

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