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Extending the Enneagon

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Author: Annie Fetter
Description: Geometry, difficulty level 3. Extend the sides AB and ED of the regular enneagon ABCDEFGHI until they intersect. What is the measure of the acute angle at this intersection? Extend sides AB and EF. Now what's the measure of that acute angle at the intersection?

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Problem page: /library/go.html?destination=435
Solution page: Problem #435

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