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Rotation
Use your mouse to move the blue point to make the angle of rotation 0º or 90º or 180º?
Rotate the blue shape more than one full turn.

What happens to the angle of rotation?


Result:
Please enable Java for an interactive construction (with Cinderella).
a0 a1 a2 a3 a4
b0 b1 b2 b3 b4
c0 c1 c2 c3 c4
d0 d1 d2 you are here d4
e0 e1 e2 e3 e4
f0 f1 f2 f3 f4
g0 g1 g2 g3 g4
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