Antiparallels An`ti*par"al*lels, n. pl. (Geom.) Straight lines or planes which make angles in some respect opposite in character to those made by parallel lines or planes. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Symmedian — Symmedians are three particular geometrical lines associated with every triangle. They are constructed by taking a median of the triangle (a line connecting a vertex with the midpoint of the opposite side), and reflecting the line over the… …   Wikipedia

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