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∑ a^3 (a^2 - b c) x (c^7 y^2 - b^7 z^2) = 0
X(6), X(31), X(32), X(560), X(1922), X(2210)
vertices of the cevian triangle of X(2210)
Geometric properties :
K1021 is the isogonal transform of K1020, also the barycentric products X(1) x K771, X(6) x K155.
It is a weak cubic anharmonically equivalent to K131 as in Table 67.