home transformations
a0 a1 a2 a3 a4
b0 b1 b2 b3 b4
rotations
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rotationsRotation
Use your mouse to move the vertices of the yellow quadrilateral and the red point.

The diagram shows a 180º rotation.

What do the four lines through the centre of rotation show?



Result:
Please enable Java for an interactive construction (with Cinderella).