HP Prime Graphing NW280AAABA manual Transform, Incircle, Locus, Parabola, Dilation

incircle

Draws the incircle of a triangle, the circle tangent to all three sides of the triangle.

incircle(point1, point2, point3)

Example:

incircle(GA, GB, GC) draws the incircle of ΔABC.

locus

Given a first point and a second point that is an element of (a point on) a geometric object, draws the locus of the first point as the second point traverses its object.

locus(point,element)

parabola

Draws a parabola, given a focus point and a directrix line, or the vertex of the parabola and a real number that represents the focal length.

parabola(point,line) or parabola(vertex,real)

Examples:

parabola(GA, GB) draws a parabola whose focus is point A and whose directrix is line B.

parabola(GA, 1) draws a parabola whose vertex is point A and whose focal length is 1.

Transform

dilation

Dilates a geometric object, with respect to a center point, by a scale factor.

homothety(point, realk, object)

Example:

homothety(GA, 2, GB) creates a dilation centered at point A that has a scale factor of 2. Each point P on geometric object B has its image P’ on ray AP such that AP’=2AP.

178 Geometry