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Rotation
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).
a0 a1 a2 a3 a4
b0 b1 b2 b3 you are here
c0 c1 c2 c3 c4
d0 d1 d2 d3 d4
e0 e1 e2 e3 e4
f0 f1 f2 f3 f4
g0 g1 g2 g3 g4
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