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How can I trisect an angle by using only compass and scale?
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High School Teacher
This is one of the three problems of antiquity that were proved impossible using Galois theory in the 18th/19th century.
It is possible to trisect some special angles: e.g. trisecting a right angle involves constructing a `30^circ` angle.
With a marked ruler it is possible. See reference links.
Posted by embizze on November 19, 2011 at 5:05 AM (Answer #2)
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