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Rotation
The blue line is a rotation of the yellow line. A is rotated to D and B is rotated to E. The perpendicular bisectors of AD (pink) and BE (green) are shown too.

What do you notice about the perpendicular bisectors?


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 d3 d4
e0 e1 e2 e3 e4
you are here f1 f2 f3 f4
g0 g1 g2 g3 g4
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