Angle Bisector


Angle Bisector

This mode is used to construct the angular bisector of two lines. The application of this mode requires a little care, since two lines do not have only one angular bisector; they have two! To take this fact into account, this mode is provided with a position-sensitive selection mechanism.

To define the angular bisector, two lines have to be selected. In order to indicate which angular bisector should be chosen, three points are relevant: the click point of the first selection, the click point of the second selection, and the intersection of the two selected lines. Imagine a triangle formed by these three points. The inner angle at the intersection point of the lines will be bisected. This is what you would intuitively expect.

To make the selection process a bit simpler, Cinderella gives graphical hints as to which angle will be bisected.

First selection:
A line is highlighted.
The selection point
is memorized.
Moving the mouse:
An indication of
the chosen angle
is given.
Second Selection:
The angular bisector
is added.


Angle bisector mode selects two lines and constructs their angular bisector.


The definition of angular bisector depends on the type of geometry (Euclidean, hyperbolic, or elliptic). In hyperbolic geometry, angular bisectors can have complex coordinates.

Contributors to this page: Richter , Kohler , Kortenkamp and Kramer .
Page last modified on Thursday 28 of July, 2011 [08:19:13 UTC] by Richter.

The content on this page is licensed under the terms of the License.

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