Decagon - Definition, Meaning & Synonyms

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SKIP TO CONTENT decagon /ˌdɛkəˈgɑn/ /ˈdɛkəgɒn/ IPA guide

Other forms: decagons

A decagon is a closed shape with ten sides and ten angles. Your geometry teacher would also tell you that a decagon is a polygon.

The word decagon comes from Greek roots, deka, or "ten," and gōnia, "angle or corner." Any ten-sided shape can be called a decagon, whether it's a street sign or the doodle you draw in your notebook during math class. Speaking of math class, in geometry you may learn that a "regular decagon" is one with sides that are all equal to each other and with internal angles that all measure 144 degrees.

Definitions of decagon

noun a polygon with 10 sides and 10 angles see moresee less type of: polygon, polygonal shape a closed plane figure bounded by straight sides

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