noun

nonagon

NON-uh-gon

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Nonagon (noun) means a nonagon is a shape with nine straight sides and nine angles. Example: “The tiler cut each piece into a nonagon before fitting them around the fountain.”

noun

technical A nonagon is a shape with nine straight sides and nine angles.

"The tiler cut each piece into a nonagon before fitting them around the fountain."

"A regular nonagon has nine equal sides and nine equal angles."

"Students were asked to sketch a nonagon and label each of its nine vertices."

How to use nonagon

Learner’s notes

In plain EnglishA nonagon is simply a nine-sided shape, sitting between an octagon and a decagon.

When to use it

Nonagon is a geometry term used mainly in maths teaching and technical drawing.

Memory tip

Count the syllable non- as nine, then it is easy to remember nonagon means nine-sided.

Trace the full origin ↓

Easily confused with

pentagon → hexagon octagon →

Common pairings

regular nonagon nonagon shape sides of a nonagon draw a nonagon

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C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

Test yourself on “nonagon” A quick quiz — meaning, synonyms & usage →

Fill the gap

Can you complete this real example?

The tiler cut each piece into a _____ before fitting them around the fountain.

Etymology

Nonagon combines the prefix nona-, meaning nine, with the suffix -gon, meaning angle. Together the parts describe a shape defined by its nine angles.

Origin: English

Rhymes for nonagon

wagon dragon Aragon octagon paragon heptagon icosagon pentagon tarragon dodecagon bandwagon pendragon

See all rhymes for nonagon →

Frequently asked questions

How many sides does a nonagon have?

A nonagon has nine sides and nine angles.

What is another name for a nonagon?

It is also called an enneagon or, less formally, a 9-gon.

Is a nonagon a type of polygon?

Yes, a nonagon is a polygon, which is any closed shape made of straight sides.

What is the meaning of nonagon?

"nonagon" (noun) means a nonagon is a shape with nine straight sides and nine angles.