'n Sewehoek of Heptagoon is 'n veelhoek met sewe sye.
"Hepta - έπτα" is Grieks vir sewe, en "gonia - γωνία" is Grieks vir hoek. Heptagone het sewe hoeke en sewe sye. 'n Reëlmatige sewehoek se hoeke is ewe groot en die sye is ewe lank.
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