Angle trisection famously cannot be accomplished by straightedge and compass. But it can be accomplished by compass and a straightedge with two marks, or by conic sections. However, none of these devices are adequate to quintisect an arbitrary angle. Is there any interesting set of geometric tools that suffices to quintisect an arbitrary angle in a finite number of steps? If so, what is that set of tools?
2026-03-30 10:53:18.1774867998
Angle Quintisection
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