Incircle of the Extangents Triangle = Incircle of the Intangents Triangle of the Extangents Triangle.

Incircle of the Extangents Triangle = Circumcircle of the Mid-Arc Triangle of the Extangents Triangle.

Nine-Point Circle of the Extangents Triangle = Circumcircle of the Euler Triangle of the Extangents Triangle.

Nine-Point Circle of the Extangents Triangle = Circumcircle of the Feuerbach Triangle of the Extangents Triangle.

Brocard Circle of the Extangents Triangle = Circumcircle of the First Brocard Triangle of the Extangents Triangle.

Brocard Circle of the Extangents Triangle = Circumcircle of the Second Brocard Triangle of the Extangents Triangle.

Orthocentroidal Circle of the Extangents Triangle = Circumcircle of the Fourth Brocard Triangle of the Extangents Triangle.

The Incircle of the Extangents Triangle is concentric to the Bevan Circle of the Yff Central Triangle of the Extangents Triangle.

The Nine-Point Circle of the Extangents Triangle is concentric to the Nine-Point Circle of the Fuhrmann Triangle of the Extangents Triangle.

The Spieker Circle of the Extangents Triangle is concentric to the Radical Circle of the Excircles of the Extangents Triangle.

The Spieker Circle of the Extangents Triangle is concentric to the Bevan Circle of the Euler Triangle of the Extangents Triangle.

The Bevan Circle of the Extangents Triangle is concentric to the Incircle of the Extangents Triangle of the Extangents Triangle.

The Radical Circle of the Excircles of the Extangents Triangle is concentric to the Spieker Circle of the Extangents Triangle.

The Radical Circle of the Excircles of the Extangents Triangle is concentric to the Bevan Circle of the Euler Triangle of the Extangents Triangle.

The Brocard Circle of the Extangents Triangle is concentric to the Lemoine Circle of the Extangents Triangle.

The Lemoine Circle of the Extangents Triangle is concentric to the Brocard Circle of the Extangents Triangle.

The Lemoine Circle of the Extangents Triangle is concentric to the Circumcircle of the First Brocard Triangle of the Extangents Triangle.

The Lemoine Circle of the Extangents Triangle is concentric to the Circumcircle of the Second Brocard Triangle of the Extangents Triangle.

The Incircle of the Extangents Triangle is congruent to the Spieker Circle of the Extangents Triangle of the Anticomplementary Triangle.

The Circumcircle of the Extangents Triangle is congruent to the Bevan Circle of the Extangents Triangle of the Medial Triangle.

The Circumcircle of the Extangents Triangle is congruent to the Nine-Point Circle of the Extangents Triangle of the Anticomplementary Triangle.

The Circumcircle of the Extangents Triangle is congruent to the Bevan Circle of the Extangents Triangle of the Euler Triangle.

The Circumcircle of the Extangents Triangle is congruent to the Bevan Circle of the Euler Triangle of the Extangents Triangle.

The Circumcircle of the Extangents Triangle is congruent to the Bevan Circle of the Feuerbach Triangle of the Extangents Triangle.

The Nine-Point Circle of the Extangents Triangle is congruent to the Circumcircle of the Extangents Triangle of the Medial Triangle.

The Nine-Point Circle of the Extangents Triangle is congruent to the Circumcircle of the Extangents Triangle of the Euler Triangle.

The Spieker Circle of the Extangents Triangle is congruent to the Incircle of the Extangents Triangle of the Medial Triangle.

The Spieker Circle of the Extangents Triangle is congruent to the Incircle of the Extangents Triangle of the Euler Triangle.

The Spieker Circle of the Extangents Triangle is congruent to the Incircle of the Euler Triangle of the Extangents Triangle.

The Spieker Circle of the Extangents Triangle is congruent to the Spieker Circle of the Intangents Triangle of the Extangents Triangle.

The Spieker Circle of the Extangents Triangle is congruent to the Nine-Point Circle of the Mid-Arc Triangle of the Extangents Triangle.

The Bevan Circle of the Extangents Triangle is congruent to the Circumcircle of the Extangents Triangle of the Anticomplementary Triangle.