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© Copyright 2000, Jim Loy
It interactively demonstrates the most common attempt at trisection of an angle, by trisecting a line between the two sides of the angle. Move the red dot in order to change the angle. And see that the three angles of the attempted trisection are not all equal. They get really close for very small angles of a few degrees.
The above Java interactive demonstration was created with Cinderella (a geometry program).
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