Conchoid

Conchoid

It is impossible to trisect an angle using only ruler and compass. Using the conchoid, however, the angle was trisected by Nicomedes in 200 B.C. ! The 3D-XplorMath animation which illustrates this is explained in “About This Object”.

Conchoid.mov

For more info, see: Conchoid_of_Nicomedes.pdf