Pascal's Angle Trisection

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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 .

Contributed by: Izidor Hafner (July 2012)
Open content licensed under CC BY-NC-SA




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

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