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See the general equation in Table 32

K424a = Acv(–π/4)

K424b = Acv(π/4)

on both curves :

X(1), X(2), X(6), excenters

on K424a :

X(371), X(485), X(493), X(3068)

on K424b :

X(372), X(486), X(494), X(3069)

K424a and K424b are the Kiepert AntiCevian Mates of the Orthocubic K006. See explanations in Table 32.

They are the isogonal pKs with pivots X(3068) and X(3069) respectively. They belong to the Thomson-Grebe pencil. See Table 13.