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Rotation
Twelve points are shown. There are 4 sets of three. In each set, one point is the centre and one of the others is a rotation of the third.

Use your mouse to move the points and find the 4 sets.
Please enable Java for an interactive construction (with Cinderella).
a0 a1 a2 a3 a4
b0 b1 b2 b3 b4
c0 you are here 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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