# Parabola

Constructs a parabola. The general function of a parabola is , with ; or, completing the square,

 parabola(Real, Point, Vector) parabola(Real, Point) parabola(Real, Vector) parabola(Real)

#### parabola(Real, Point, Vector)

Given a real , a point and a vector , constructs a parabola with focal semidistance equal to , vertex at point and direction given by .

#### parabola(Real, Point)

Given a real and a point , constructs a parabola with focal semidistance equal to , vertex at point and direction given by .

#### parabola(Real, Vector)

Given a real and a vector , constructs a parabola with focal semidistance equal to , vertex at the origin and direction given by .

#### parabola(Real, Point, Vector)

Given a real , constructs a parabola with focal semidistance equal to , vertex at the origin and direction given by .