The following topics are immediate subtopics of Precalculus.

Term: Asymptote
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 Definition: A line or curve that the graph of a relation approaches more and more closely the further the graph is followed.

Term: Conic Section
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 Definition: The conic sections are the nondegenerate curves generated by the intersections of a plane with one or two nappes of a cone. For a plane perpendicular to the axis of the cone, a circle is produced. ...

Term: Directrix
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 Definition: The directrix of a conic section is the line which, together with the point known as the focus, serves to define a conic section as the locus of points whose distance from the focus is proportional...

Term: Domain
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 Definition: The set of values of the independent variable(s) for which a function or relation is defined. Typically, this is the set of xvalues that give rise to real yvalues.

Term: Eccentricity
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 Definition: A quantity defined for a conic section which can be given in terms of semimajor a and semiminor axes b.

Term: Ellipse
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 Definition: An ellipse is a curve that is the locus of all points in the plane the sum of whose distances r_1 and r_2 from two fixed points F_1 and F_2 (the foci) separated by a distance of 2c is a given posit...

Term: Focus
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 Definition: A point related to the construction and properties of conic sections. Hyperbolas and noncircular ellipses have two distinct foci and two associated conic section directrices, each directrix being p...

Term: Function
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 Definition: A function is a procedure for assigning a unique output to any allowable input.

Term: Hyperbola
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 Definition: A hyperbola (plural "hyperbolas"; Gray 1997, p. 45) is a conic section defined as the locus of all points P in the plane the difference of whose distances r_1=F_1P and r_2=F_2P from two fixed point...

Term: Parabola
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 Definition: A plane curve generated by a point moving so that its distance from a fixed point is equal to its distance from a fixed line : the intersection of a right circular cone with a plane parallel to an ...