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∑ a^2 (a^4 - b^2 c^2) (c^3 y - b^3 z) y z = 0

X(1), X(31), X(82), X(171), X(238), X(293), X(1580), X(1581), X(1740), X(1966), X(2236), X(9285)

vertices of the cevian triangle of X(31)

Geometric properties :

K989 is the barycentric products X(1) x K739, X(75) x K788, X(6) x K992.

Its isogonal transform is K990 and its isotomic transform is K995.

It is a cubic anharmonically equivalent to K020 as in Table 66.