Trisecting the Angle/Conchoid of Nicomedes

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Theorem

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

This can be achieved by means of a conchoid of Nicomedes.


Construction


Proof


Also see


Historical Note

While Nicomedes originally designed his conchoid for Doubling the Cube, it can also be used for the technique of trisecting an angle.


Sources