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Rotation
Move the red point. What happens?
Use it to measure the angle of rotation from the blue shape to the yellow shape. These angles are measured anti-clockwise.
Please enable Java for an interactive construction (with Cinderella).
Create a rotation of 60º or 120º. Can you create a rotation of -100º?
a0 a1 a2 a3 a4
b0 b1 b2 b3 b4
c0 c1 c2 c3 c4
d0 d1 you are here d3 d4
e0 e1 e2 e3 e4
f0 f1 f2 f3 f4
g0 g1 g2 g3 g4

Construct the angle yourself
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