construction of an angle equal to one third a given angle
Angles may be trisected via a neusis construction using tools beyond an unmarked straightedge and a compass. The example shows trisection of any angle θ > 3π/4 by a ruler with length equal to the radius of the circle, giving trisected angle φ = θ/3.
Angle trisection is the construction of an angle equal to one third of a given arbitrary angle, using only two tools: an unmarked straightedge and a compass. It is a classical problem of straightedge and compass construction of ancient Greek mathematics.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).