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decagon

noun
/ˈdekəɡən/
/ˈdekəɡɑːn/
(geometry几何)
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  1. a flat shape with ten straight sides and ten angles十边形;十角形 compare decahedronTopics Colours and Shapesc2
    Word Originmid 17th cent.: via medieval Latin from Greek dekagōnon, neuter (used as a noun) of dekagōnos ‘ten-angled’.

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