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190 Geometry
is_harmonic_line_bundle
Returns 1 if the lines are concurrent, 2 if they are all parallel,
3 if they are the same line and 0 otherwise.
is_harmonic_line_bundle({line1, line2, …,
linen}))
is_rhombus
Tests whether or not a set of four points are vertices of a
rhombus. Returns 0 if they are not, 1 if they are, and 2 if they
are vertices of a square.
is_rhombus(point1, point2, point3, point4)
Example:
is_rhombus(point(0,0), point(-2,2),
point(0,4), point(2,2)) returns 2
LineHorz
Draws the horizontal line y=a.
LineHorz(a)
Example:
LineHorz(-2) draws the horizontal line whose equation is
y = –2
LineVert
Draws the vertical line x=a.
LineVert(a)
Example:
LineVert(–3) draws the vertical line whose equation is x
= –3
open_polygon
Connects a set of points with line segments, in the given order,
to produce a polygon. If the last point is the same as the first
point, then the polygon is closed; otherwise, it is open.
open_polygon(point1, point2, …, point1) or
open_polygon(point1, point2, …, pointn)