trisection

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trisection

[trī′sek·shən]
(mathematics)
The problem of dividing an angle into three equal parts, which is impossible to do with straight edge and compass alone.
References in periodicals archive ?
Archimedes' method uses a marked straight edge and compass to trisect any angle.
Realists ought to take the former very seriously, but we have learned, all too thoroughly, that pursuing the second is like trying to trisect an arbitrary angle with ruler and compass or proving the consistency of arithmetic with finitary means.
But Matthew Warchus' decidedly cool take on the play, notwithstanding an A-list cast dominated by a memorably quivering Mark Rylance, doesn't fend off one's feeling that "Life x 3" is alarmingly inconsequential, no matter how you trisect it.
Iranian agents, Wahhabi money, Kurdish nationalism, al-Qaeda jihadists, ex-Baathists, and Turkish invasions have all failed to trisect the Iraqi state.