How to bisect an angle | Euclid Elements Book 1 Proposition 9

Book1Prop9 page: https://mathcs.clarku.edu/~djoyce/java/elements/bookI/propI9.html
Book1Post2 page: https://mathcs.clarku.edu/~djoyce/java/elements/bookI/post2.html

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Archimedes neusis angle trisection GeoGebra: https://www.geogebra.org/m/yfze3egn

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