Definition of decagon in English:

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decagon

Pronunciation: /ˈdekəˌɡän/

noun

A plane figure with ten straight sides and angles.
Example sentences
  • How much more sacred than our triangle would be a square, a pentagon, a decagon, a figure with a hundred sides?
  • Decagons Here is a decagon - a 10-sided regular polygon with all its angles equal and all its sides the same length - which has been divided into 10 triangles.
  • You can buy 10-sided dice (bi-pyramids) or else you can cut out a decagon (a 10-sided polygon with all sides the same length) from card and label the sides from to 9.

Derivatives

decagonal

Pronunciation: /dekˈaɡ(ə)n(ə)l/
adjective
Example sentences
  • We find that some atoms leave the decagonal layers to form icosahedral clusters.
  • The first few odd decagonal numbers are 1, 27, 85, 175, 297,…, and the first few even decagonal numbers are 10, 52, 126, 232, 370, 540,….

Origin

Mid 17th century: via medieval Latin from Greek dekagōnon, neuter (used as a noun) of dekagōnos 'ten-angled'.

For editors and proofreaders

Syllabification: dec·a·gon

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