A rotation can be defined in two different ways: One way is by choosing the mode Rotation P|Ang, which defines a rotation by a rotation center and an angle (which is given by a number). To apply this mode one has to click the center of a rotation and a text in the drawing that represents the requested angle (for instance a measured angle). Alternatively, one can use Rotation LL mode. For this one has to click two different lines that serve as a sample for an image and a preimage.
The mode Rotation P|Ang can be particularly useful if the rotation angle is an already measured angle or if the rotation angle must satisfy a certain predefined value. The mode Rotation LL is useful whenever a line and its image under the rotation are already available.
The picture below shows an iterated application of a rotation to a circle.
Rotations are also defined in hyperbolic and elliptic geometry.
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