HP Prime Graphing Wireless Calculator - Manual (Page 48)

44 Geometry
perpendicular(3+2i,line(x–y=1)) draws a line
through the point whose coordinates are (3, 2) that is
perpendicular to the line whose equation is x – y = 1; that is,
the line whose equation is y=–x+5.
Tangent
Draws the tangent(s) to a given curve through a given point.
The point does not have to be a point on the curve.
tangent(curve, point)
Examples:
tangent(plotfunc(x^2), GA) draws the tangent to the
graph of y=x^2 through point A.
tangent(circle(GB, GC–GB), GA) draws one or more
tangent lines through point A to the circle whose center is at
point B and whose radius is defined by segment BC.
Median
Given three points that define a triangle, creates the median
of the triangle that passes through the first point and contains
the midpoint of the segment defined by the other two points.
median_line(point1, point2, point3)
Example:
median_line(0, 8i, 4) draws the line whose equation
is y=2x; that is, the line through (0,0) and (2,4), the midpoint
of the segment whose endpoints are (0, 8) and (4, 0).
Altitude
Given three non-collinear points, draws the altitude of the
triangle defined by the three points that passes through the
first point. The triangle does not have to be drawn.
altitude(point1, point2, point3)
Example: altitude(A, B, C) draws a line passing
through point A that is perpendicular to BC.
Bisector
Given three points, creates the bisector of the angle defined
by the three points whose vertex is at the first point. The angle
does not have to be drawn in the Plot view.
bisector(point1, point2, point3)