Spieker Center = Incenter of the Pedal Triangle of the Circumcenter.

Spieker Center = Incenter of the Cyclocevian Triangle of the Orthocenter.

Spieker Center = Nagel Point of the Half-cevian Triangle of the Centroid.

Spieker Center = Circumcenter of the Half-cevian Triangle of the Nagel Point.

Spieker Center = Bevan Point of the Euler Triangle.

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

Spieker Center = Circumcenter of the Intouch Triangle of the Medial Triangle.

Spieker Center = Nagel Point of the Orthic Triangle of the Circum-Incentral Triangle.

Spieker Center = Orthocenter of the Excentral Triangle of the Medial Triangle.

Spieker Center = Orthocenter of the Circum-Incentral Triangle of the Medial Triangle.

Spieker Center = de Longchamps Point of the Circum-Incentral Triangle of the Euler Triangle.

Spieker Center = Orthocenter of the Fuhrmann Triangle of the Medial Triangle.

Spieker Center = Circumcenter of the Mid-Arc Triangle of the Medial Triangle.

Spieker Center = Bevan Point of the Yff Central Triangle of the Medial Triangle.

Spieker Center = Midpoint of the Incenter and Nagel Point.

Spieker Center = Midpoint of the Incenter and Incenter of the Anticomplementary Triangle.

Spieker Center = Midpoint of the Circumcenter and Nagel Point of the Euler Triangle.

Spieker Center = Midpoint of the Nagel Point and Nagel Point of the Medial Triangle.

Spieker Center = Midpoint of the Nagel Point and Orthocenter of the Excentral Triangle.

Spieker Center = Midpoint of the Bevan Point and Orthocenter.

Spieker Center = Midpoint of the Bevan Point and Circumcenter of the Anticomplementary Triangle.

Spieker Center = Midpoint of the Bevan Point and Orthocenter of the Euler Triangle.

Spieker Center = Midpoint of the Circumcenter of the Intouch Triangle and Nagel Point.

Spieker Center = Midpoint of the Circumcenter of the Intouch Triangle and Incenter of the Anticomplementary Triangle.

Spieker Center = Midpoint of the Incenter of the Anticomplementary Triangle and Nagel Point of the Medial Triangle.

Spieker Center = Midpoint of the Incenter of the Anticomplementary Triangle and Orthocenter of the Excentral Triangle.

Spieker Center = Midpoint of the Nagel Point of the Euler Triangle and Orthocenter of the Medial Triangle.

Spieker Center = Midpoint of the Nagel Point of the Euler Triangle and Nine-Point Center of the Excentral Triangle.

Spieker Center = Midpoint of the Nagel Point of the Euler Triangle and Nine-Point Center of the Anticomplementary Triangle.

Spieker Center = Reflection of the Incenter of the Euler Triangle in the Nine-point Center.

Spieker Center = Reflection of the Incenter of the Euler Triangle in the Circumcenter of the Orthic Triangle.

Spieker Center = Reflection of the Incenter of the Euler Triangle in the Circumcenter of the Euler Triangle.

Spieker Center = Reflection of the Incenter of the Euler Triangle in the Circumcenter of the Feuerbach Triangle.

Spieker Center = Harmonic Congugate of the Incenter with respect to the Centroid and Nagel Point.

Spieker Center = Complement of the Incenter.

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

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

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

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

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

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

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

Spieker Center = Complement of the Reflection of the Nagel Point in the Spieker Center.

Spieker Center = Complement of the Reflection of the Bevan Point in the Circumcenter.

Spieker Center = Complement of the Perspector of the Intouch Triangle and s-Reflection Triangle of the Incenter.

Spieker Center = Complement of the Perspector of the Excentral Triangle and Circum-Incentral Triangle.

Spieker Center = Complement of the Perspector of the Anticevian Triangle of the Mittenpunkt and Half-cevian Triangle of the Gergonne Point.

Spieker Center = Complement of the Perspector of the Cyclocevian Triangle of the Gergonne Point and s-Reflection Triangle of the Incenter.

Spieker Center = Complement of the Perspector of the Incentral Triangle and Mixtilinear Triangle.

Spieker Center = Complement of the Perspector of the Incentral Triangle and Mid-Arc Triangle.

Spieker Center = Complement of the Perspector of the Incentral Triangle and Malfatti Triangle.

Spieker Center = Complement of the Perspector of the Extouch Triangle and Half-Altitude Triangle.

Spieker Center = Complement of the Perspector of the Excentral Triangle and Incentral Triangle.

Spieker Center = Complement of the Perspector of the Excentral Triangle and Mixtilinear Triangle.

Spieker Center = Complement of the Perspector of the Excentral Triangle and Mid-Arc Triangle.

Spieker Center = Complement of the Perspector of the Excentral Triangle and Malfatti Triangle.

Spieker Center = Complement of the Perspector of the Circum-Incentral Triangle and Incentral Triangle.

Spieker Center = Complement of the Perspector of the Circum-Incentral Triangle and Mixtilinear Triangle.

Spieker Center = Complement of the Perspector of the Circum-Incentral Triangle and Mid-Arc Triangle.

Spieker Center = Complement of the Perspector of the Circum-Incentral Triangle and Malfatti Triangle.

Spieker Center = Complement of the Perspector of the Intangents Triangle and Intouch Triangle.

Spieker Center = Complement of the Perspector of the Mid-Arc Triangle and Mixtilinear Triangle.

Spieker Center = Complement of the Perspector of the Malfatti Triangle and Mixtilinear Triangle.

Spieker Center = Complement of the Perspector of the Malfatti Triangle and Mid-Arc Triangle.

Spieker Center = Anticomplement of the Spieker Center of the Medial Triangle.

Spieker Center = Anticomplement of the Midpoint of the Incenter and Spieker Center.

Spieker Center = Isogonal Complement of the Incenter.

Spieker Center = 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 Spieker Center of the Anticomplementary Triangle.

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

Spieker 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 Reflection of the Nagel Point in the Spieker Center.

Spieker Center = Isogonal Complement of the Reflection of the Bevan Point in the Circumcenter.

Spieker Center = Isogonal Complement of the Perspector of the Intouch Triangle and s-Reflection Triangle of the Incenter.

Spieker Center = Isogonal Complement of the Perspector of the Excentral Triangle and Circum-Incentral Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Anticevian Triangle of the Mittenpunkt and Half-cevian Triangle of the Gergonne Point.

Spieker Center = Isogonal Complement of the Perspector of the Cyclocevian Triangle of the Gergonne Point and s-Reflection Triangle of the Incenter.

Spieker Center = Isogonal Complement of the Perspector of the Incentral Triangle and Mixtilinear Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Incentral Triangle and Mid-Arc Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Incentral Triangle and Malfatti Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Extouch Triangle and Half-Altitude Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Excentral Triangle and Incentral Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Excentral Triangle and Mixtilinear Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Excentral Triangle and Mid-Arc Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Excentral Triangle and Malfatti Triangle.

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

Spieker Center = Isogonal Complement of the Perspector of the Circum-Incentral Triangle and Mixtilinear Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Circum-Incentral Triangle and Mid-Arc Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Circum-Incentral Triangle and Malfatti Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Intangents Triangle and Intouch Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Mid-Arc Triangle and Mixtilinear Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Malfatti Triangle and Mixtilinear Triangle.

Spieker Center = Isogonal Complement of the Perspector of the Malfatti Triangle and Mid-Arc Triangle.

Spieker Center = Perspector of the Extouch Triangle and Half-cevian Triangle of the Incenter.

Spieker Center = Perspector of the Cevian Triangle of the Spieker Center and Anticevian Triangle of the Spieker Center.

Spieker Center = Perspector of the Cevian Triangle of the Spieker Center and Circumcevian Triangle of the Spieker Center.

Spieker Center = Perspector of the Cevian Triangle of the Spieker Center and Half-cevian Triangle of the Spieker Center.

Spieker Center = Perspector of the Anticevian Triangle of the Spieker Center and Circumcevian Triangle of the Spieker Center.

Spieker Center = Perspector of the Anticevian Triangle of the Spieker Center and Half-cevian Triangle of the Spieker Center.

Spieker Center = Perspector of the Pedal Triangle of the Spieker Center and Half-cevian Triangle of the Nagel Point.

Spieker Center = Perspector of the Pedal Triangle of the Bevan Point and Half-cevian Triangle of the Incenter.

Spieker Center = Perspector of the Half-cevian Triangle of the Nagel Point and s-Reflection Triangle of the Spieker Center.

Spieker Center = Internal Similitude Center of the Radical Circle of the Excircles and Spieker Circle.

Spieker Center = Internal Similitude Center of the Radical Circle of the Excircles and Bevan Circle of the Euler Triangle.

Spieker Center = Internal Similitude Center of the Apollonius Circle and Bevan Circle of the Medial Triangle.

Spieker Center = External Similitude Center of the Spieker Circle and Bevan Circle of the Euler Triangle.

Spieker Center = External Similitude Center of the Nine-Point Circle of the Medial Triangle and Nine-Point Circle of the Circum-Incentral Triangle.

The Spieker Center lies on the Nagel Line.

The Spieker Center lies on the Line defined by the Incenter and Nagel Point.

The Spieker Center lies on the Line defined by the Centroid and Nagel Point.

The Spieker Center lies on the Line defined by the Orthocenter and Mittenpunkt.

The Spieker Center lies on the Line defined by the Orthocenter and Clawson Point.

The Spieker Center lies on the Line defined by the Orthocenter and Bevan Point.

The Spieker Center lies on the Line defined by the Nine-point Center and Center of the Apollonius Circle.

The Spieker Center lies on the Line defined by the Mittenpunkt and Clawson Point.

The Spieker Center lies on the Line defined by the Mittenpunkt and Bevan Point.

The Spieker Center lies on the Line defined by the Second Feuerbach Point and Apollonius Point.

The Spieker Center lies on the Line defined by the Clawson Point and Bevan Point.

The Spieker Center lies on the Nine-Point Circle of the Fuhrmann Triangle.

The Spieker Center lies on the Brocard Circle of the Intouch Triangle of the Medial Triangle.

The Spieker Center lies on the Circumcircle of the Medial Triangle of the Fuhrmann Triangle.

The Spieker Center lies on the Circumcircle of the Orthic Triangle of the Fuhrmann Triangle.

The Spieker Center lies on the Circumcircle of the Symmedial Triangle of the Fuhrmann Triangle.

The Spieker Center lies on the Orthocentroidal Circle of the Excentral Triangle of the Medial Triangle.

The Spieker Center lies on the Brocard Circle of the Excentral Triangle of the Euler Triangle.

The Spieker Center lies on the Bevan Circle of the Intangents Triangle of the Medial Triangle.

The Spieker Center lies on the Orthocentroidal Circle of the Fuhrmann Triangle of the Medial Triangle.

The Spieker Center lies on the Brocard Circle of the Mid-Arc Triangle of the Medial Triangle.

The Spieker Center lies on the Bevan Circle of the Extangents Triangle of the Euler Triangle.

The Spieker Center lies on the Circumcircle of the Euler Triangle of the Fuhrmann Triangle.

The Spieker Center lies on the Circumcircle of the Feuerbach Triangle of the Fuhrmann Triangle.