Presents a geometric construction to achieve a precise 20-degree angle approximation using basic tools.
This paper presents a novel geometric construction using an unmarked straightedge and compass to approximate a 20° angle. By algebraically combining constructible irrational lengths and dividing them geometrically, the method achieves an angle of approximately 19.9981°, representing an accuracy of 99.99% relative to the true value
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Eisa Fokra (2026) studied this question.
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