# Neusis Logic Action = GoGeometry Action 56!

Creation of this applet was inspired by a post from Antonio Gutierrez (GoGeometry.)

**Move the LARGE PINK POINT anywhere you'd like (along the circle).****How can we formally prove what this applet informally illustrates?**Some ancient Greek mathematicians used this method to trisect an angle. Can you see why?
For more information, see this Wikipedia article.

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