HP Prime Graphing Wireless Calculator - Manual (Page 70)

66 Geometry
orthocenter
Returns the orthocenter of a triangle; that is, the intersection of
the three altitudes of a triangle. The argument can be either
the name of a triangle or three non-collinear points that define
a triangle. In the latter case, the triangle does not need to be
drawn.
orthocenter(triangle) or orthocenter(point1,
point2, point3)
Example: orthocenter(0,4i,4) returns (0,0)
perpendicular bisector
Draws the perpendicular bisector of a segment. The segment
is defined either by its name or by its two endpoints.
perpen_bisector(segment) or
perpen_bisector(point1, point2)
Examples:
perpen_bisector(GC) draws the perpendicular bisector
of segment C.
perpen_bisector(GA, GB) draws the perpendicular
bisector of segment AB.
perpen_bisector(3+2i, i) draws the perpendicular
bisector of a segment whose endpoints have coordinates (3,
2) and (0, 1); that is, the line whose equation is y=x/3+1.
point2d
Randomly re-distributes a set of points such that, for each
point, x ∈ [–5,5] and y ∈ [–5,5]. Any further movement of
one of the points will randomly re-distribute all of the points
with each tap or direction key press.
point2d(point1, point2, …, pointn)
polar
Returns the polar line of the given point as pole with respect
to the given circle.
polar(circle, point)
Example:
polar(circle(x^2+y^2=1),point(1/3,0)) returns
x=3