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Angle trisection
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===With interconnected compasses=== An angle can be trisected with a device that is essentially a four-pronged version of a compass, with linkages between the prongs designed to keep the three angles between adjacent prongs equal.<ref>Isaac, Rufus, "Two mathematical papers without words", ''[[Mathematics Magazine]]'' 48, 1975, p. 198. Reprinted in ''Mathematics Magazine'' 78, April 2005, p. 111.</ref>
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