Dr. Geo User's Manual -- Rotation

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#### Rotation

Create the image of an object by a rotation. The user selects the point to transform, the centre and the angle of the rotation. When the user wants to create the image of a point, s/he must first select it (with the mouse). The transformation will then be performed on this selected point.

The angle can be selected from different type of value:

- numeric value: in this case the angle is expressed in radians. Examples of numeric values are: free value, distance between two points, a segment length, a coordinate, a value returned by a Dr. Genius Guile Script, etc.;
- a geometric angle formed by three points: in this case the angle is expressed in degrees. Be aware that in this case the angle can only fall within [0 ; 180];
- an oriented angle formed by two vectors: in this case the angle is expressed in degrees between [0 ; 360[.

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