WOLFRAM|DEMONSTRATIONS PROJECT

Trisection by Sliding a Line

angle AOB (α)

move D

This Demonstration shows how to trisect an angle by sliding a line. Adjust the angle to trisect,

AOB

, and then move point

D

so that the point

O

is on the line

CD

. The point

C

is chosen so that

CD

is twice

OA

. The angle

COB

is a third of the angle

AOB

.