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nonagon
This term is primarily used in technical, mathematical, and architectural contexts. It describes a specific polygon, and while it is a precise geometric term, it is far less common in everyday conversation than terms like triangle or square.
In geometry, a nonagon is often referred to as an enneagon. While both terms are correct, nonagon is more frequent in general educational settings, whereas enneagon is often preferred in higher-level mathematics to maintain consistency with Greek numerical prefixes.
Meanings
Examples
The sum of the interior angles of a regular nonagon is 1260 degrees.
Draw a nonagon using a ruler and a protractor.
Draw a nonagon using a ruler and a protractor.
I wonder if I can fit a nonagon inside this circle.
The architect designed the plaza in the shape of a nonagon.
Is this an irregular nonagon or a regular one?
The ancient seal was carved as a perfect nonagon.
He spent the afternoon calculating the area of a nonagon.