How to Say "pentagon" in Spanish
The Spanish word for “pentagon” is “pentágono” — B1 level.

Examples
Un pentágono tiene cinco lados y cinco ángulos.
A pentagon has five sides and five angles.
La base de la torre tiene forma de pentágono.
The base of the tower is shaped like a pentagon.
El Pentágono emitió un comunicado oficial esta mañana.
The Pentagon issued an official statement this morning.
Always Masculine
Even though it ends in 'o', just remember it always takes 'el' or 'un'. Geometric shapes in Spanish are almost always masculine.
The Accent Mark
This word has an accent on the 'á' because the voice is strongest on the third-to-last syllable. In Spanish, these words always need a written accent mark.
Missing the Accent
Mistake: “pentagono”
Correction: pentágono (The accent mark is required to show where the stress falls when speaking).
Related Translations
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