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heptagon

noun
/ˈheptəɡən/
/ˈheptəɡɑːn/
(geometry几何)
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  1. a flat shape with seven straight sides and seven angles七边形;七角形Topics Colours and Shapesc2
    Word Originlate 16th cent.: from Greek heptagonon, neuter (used as a noun) of heptagonos ‘seven-angled’.

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