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Angle Trisection -- from Wolfram MathWorld

Angle trisection using compass and tape measure – GeoGebra

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Angle trisection

Angle trisection

circles - Proving an approximate angle trisection by compass and straightedge - Mathematics Stack Exchange

Trisection of an Angle Construction with GeoGebra

Trisection of an Angle Construction with GeoGebra

angle trisection – GeoGebra

Trisecting an Angle – GeoGebra