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There are trisectable angles that are not constructible

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Visit this site: http://www.cut-the-knot.org/do_you_know/trisect.shtml
Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: Why certain angles that are trisectable cannot be constructed by traditional methods.
Levels: High School (9-12), College
Languages: English
Math Topics: Pi, Constructions, Triangles and Other Polygons, Trigonometry

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