Angle trisection using compass and tape measure – GeoGebra

Mathematical Mysteries: Trisecting the Angle

trisection of a segment – GeoGebra

The Basics – GeoGebra

Maths in a minute: Trisecting the angle

Trisection of a Segment in GeoGebra

Angle trisection by Paul Vjecsner – GeoGebra

Measuring Angles Using Protractor – GeoGebra

Angle Trisection -- from Wolfram MathWorld

On the impossibility of trisecting an angle

Angles and Their Measurements – GeoGebra

Trisecting the Angle

Angle Trisection by Paper Folding! – GeoGebra

Intersecting Chords Angle Measure Theorem – GeoGebra

Measuring Angles Using a Protractor – GeoGebra

PDF) The Angle Trisection Solution (A Compass-Straightedge (Ruler) Construction)