Wolfram Demonstrations Project

This Demonstration shows Pascal's angle trisection. The red segments are the same length. Vary

so that the last red segment overlaps the top ray of angle

. Then

is one-third the size of

Reference

J. Bryant and C. Sangwin, How Round Is Your Circle?, Princeton, NJ: Princeton University Press, 2008 p. 107.

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Pascal's Angle Trisection