from The Century Dictionary and Cyclopedia

  • n. If BCX, ACY, and ABZ are triangles constructed externally on the sides of ABC, and BCX′ , ACY′ , and ABZ′ triangles constructed internally, and all six are similar to δT, the straights AX, BY, and CZ cointersect in T1, prime metapole of ABC and T; the straights AX′ , BY′ , and CZ′ in T2, second metapole of ABC and T.


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