# Angle Trisection Method by Nicomedes

- Author:
- Keith Dreiling

## Explanation and Instructions

Line is parallel to line and line is perpendicular to line Points and are marked on a straightedge so that The straightedge is aligned with point while point slides freely along line To use the applet, drag point until point lies on line The measure of should be three times the measure of that is Slide point along line to change the measure of angle and repeat the process.
This method can be proven through the use of isosceles triangles and Let Then and Therefore,