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X(1), X(399), X(517), X(3465), X(5526), X(5527), X(6326), X(11697), X(13541), X(13866), X(47623), X(56741), X(64761), X(68402), X(71537), X(71538), X(71539), X(71540), X(71541), X(71542), X(71543), X(71544), X(71545), X(71546)

vertices of the excentral triangle

Geometric properties :

K1448 is the excentral-polar-circle-inverse of the Feuerbach hyperbola.

It is a strophoid with singular focus X(6326) = excentral-polar-circle-inverse of X(80), and node X(1) with nodal tangents parallel to the asymptotes of the Feuerbach hyperbola.