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X(99), X(523)

K197 is the only isotomic circular nK0. Remember that the Droussent cubic K008 is the only isotomic circular pK.

K197 is circular with singular focus F = X(14605) on the lines X(3)X(67), X(74)X(9069).

Its root is X(14568), the intersection of the lines X(2)X(76) and X(115)X(316).

It belongs to a pencil of circular isotomic nKs described in the page K088.

See the related K214.