Isogonal Complement of the Incenter = Spieker Center.

Isogonal Complement of the Circumcenter = Circumcenter.

Isogonal Complement of the Orthocenter = Nine-point Center.

Isogonal Complement of the Symmedian Point = Centroid.

Isogonal Complement of the Internal Center of Similitude of Circumcircle and Incircle = Mittenpunkt.

Isogonal Complement of the External Center of Similitude of Circumcircle and Incircle = Incenter.

Isogonal Complement of the Orthocenter of the Medial Triangle = Circumcenter.

Isogonal Complement of the Nagel Point of the Medial Triangle = Spieker Center.

Isogonal Complement of the Circumcenter of the Intouch Triangle = Spieker Center.

Isogonal Complement of the Orthocenter of the Excentral Triangle = Spieker Center.

Isogonal Complement of the Nine-Point Center of the Excentral Triangle = Circumcenter.

Isogonal Complement of the Circumcenter of the Anticomplementary Triangle = Nine-point Center.

Isogonal Complement of the Nine-Point Center of the Anticomplementary Triangle = Circumcenter.

Isogonal Complement of the Spieker Center of the Anticomplementary Triangle = Spieker Center.

Isogonal Complement of the Circumcenter of the Circum-Incentral Triangle = Circumcenter.

Isogonal Complement of the Orthocenter of the Circum-Incentral Triangle = Spieker Center.

Isogonal Complement of the Circumcenter of the Circum-Medial Triangle = Circumcenter.

Isogonal Complement of the Circumcenter of the Circum-Orthic Triangle = Circumcenter.

Isogonal Complement of the Orthocenter of the Euler Triangle = Nine-point Center.

Isogonal Complement of the Orthocenter of the Fuhrmann Triangle = Spieker Center.

Isogonal Complement of the Circumcenter of the Mid-Arc Triangle = Spieker Center.

Isogonal Complement of the Symmedian Point of the Fourth Brocard Triangle = Centroid.