Joseph Tonien, Trisecting an angle correctly up to arcminute,
Forum Geometricorum, 16 (2016) 37--41.

Abstract. We present a simple compass-and-straightedge construction method of approximately trisecting an angle. This method is applicable to both acute and obtuse angles. With an original angle α, the construction gives an angle τ with error |ε| = |τ - α/3| < .0155˚.

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