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A pentagon is a five-sided figure, typically found in geometry. The Pentagon in Washington D.C. is five sided and named after the polygon. A pentagon is a thing, so it would be a noun.

Some examples of sentences where the word pentagon functions as a noun are:

"A pentagon has five sides." (subject)

"That shape is a pentagon." (Predicate Nominative; a nominative is a fancy word for noun)

Hope that helps!

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15y ago

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