List K External Center of Similitude of Circles of the Gossard Triangle. Points available at the Kimberling's Encyclopedia ETC. The ETC version: The 8998 points version of 2015. The "Discoverer" database version: October 2013. Last update: 2016-05-08- The External Center of Similitude of the Circumcircle and the Nine-Point Circle of the Gossard Triangle is the X(4240).
- The External Center of Similitude of the Circumcircle and the Antimedial Circle of the Gossard Triangle is the X(1650).
- The External Center of Similitude of the Incircle and the Spieker Circle of the Gossard Triangle is the X(4240).
- The External Center of Similitude of the Nine-Point Circle and the Circumcircle of the Gossard Triangle is the X(1650).
- The External Center of Similitude of the Antimedial Circle and the Circumcircle of the Gossard Triangle is the X(4240).
- The External Center of Similitude of the Spieker Circle and the Incircle of the Gossard Triangle is the X(1650).
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