Trisecting the Angle/Cissoid of Diocles

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Theorem

Let $\alpha$ be an angle which is to be trisected.

This can be achieved by means of a cissoid of Diocles.


Construction


Proof


Also see


Historical Note

The technique of trisecting an angle by means of the cissoid of Diocles was used by Diocles of Carystus.


Sources