In geometry, a nonagon is a nine-sided polygon or 9-gon. Calculate its area and perimeter.

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In geometry, a nonagon is a nine-sided polygon or 9-gon. Calculate its area and perimeter.

`Nonagon Formulas`

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In geometry, a nonagon is a nine-sided polygon or 9-gon. Calculate its area and perimeter.

$A$, Symbol for Area;

${P}_{}$, Symbol for Perimeter;

${a}_{}$, Symbol for Side;

$A=\frac{9}{4}{a}^{2}\mathrm{cot}\left(\frac{{180}^{o}}{9}\right)$

$P=9a$

^{Figure - 24.1} https://www.redbubble.com/people/keplercat/works/27929051-nonagon-shape-black?p=poster