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Yff triangles
The first Yff triangle is the Cevian triangle Δ A' B' C' of the first Yff point. The area of the first Yff triangle is Δ = u^3/(2R), where R is the circumradius of the reference triangle. This is the same area as the second Yff triangle.
second Yff triangle | Yff central triangle | Yff contact triangle | Yff points
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