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Rotation
Use your mouse to move the vertices of the yellow triangle. Look at the angle formed by the two lines going to the centre of the rotation.

What property do these lines always have?


Result:
Please enable Java for an interactive construction (with Cinderella).
a0 a1 a2 a3 a4
b0 b1 b2 b3 b4
c0 c1 c2 you are here 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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