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X(1), X(1022), X(1023) feet of the antiorthic axis (inflexion points) 

K228 is an isogonal circumconicopivotal cubic (See Special Isocubics ยง8.3). Compare K228 with K015, isotomic circumconicopivotal cubic. K015 and K229 are two members of CL064. It is an unicursal cubic with singularity at I (incenter). See also Table 69. For any point M on K228, the line through M and its isogonal conjugate M* envelopes the circumellipse with perspector I, center X(9) the mittenpunkt. K228 is tritangent at A, B, C to this ellipse. 
