Line Tools

mode_angularbisector_32 Angle Bisector

Angle bisectors can be defined in two ways (also see command AngleBisector):

·        Selecting three points A, B, and C produces the angle bisector of the enclosed angle, where point B is the apex.

·        Selecting two lines produces their two angle bisectors.

Note: The direction vectors of all angle bisectors have length 1.

mode_fitline_32 Best Fit Line

Create the best fit line for a set of points in the following ways (also see command FitLine):

·        Create a selection rectangle that contains all points.

·        Select a list of points to create their corresponding best fit line.

mode_join_32 Line through Two Points

Selecting two points A and B creates a straight line through A and B (also see command Line).

Note: The line’s direction vector is (B - A).

mode_parallel_32 Parallel Line

Selecting a line g and a point A defines a straight line through A parallel to g (also see command Line).

Note: The line’s direction is the direction of line g.

mode_linebisector_32 Perpendicular Bisector

Click on either a segment s or two points A and B in order to create a perpendicular bisector (also see command PerpendicularBisector).

Note: The bisector’s direction is equivalent to the perpendicular vector of segment s or AB (also see command PerpendicularVector).

mode_orthogonal_32 Perpendicular Line

Selecting a line g and a point A creates a straight line through A perpendicular to line g (also see command PerpendicularLine).

Note: The line’s direction is equivalent to the perpendicular vector of g (also see command PerpendicularVector).

mode_polarline_32 Polar or Diameter Line

This tool creates the polar or diameter line of a conic section (also see command Polar).

·        Select a point and a conic section to get the polar line.

·        Select a line or a vector and a conic section to get the diameter line.

mode_tangent_32 Tangents

Tangents to a conic section can be produced in several ways (also see command Tangent):

·        Selecting a point A and a conic c produces all tangents through A to c.

·        Selecting a line g and a conic c produces all tangents to c that are parallel to line g.

·        Selecting a point A and a function f produces the tangent line to f in x = x(A).
Note: x(A) represents the x-coordinate of point A. If point A lies on the function graph, the tangent runs through point A.


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