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heptagon

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heptagon/ˈhɛptəˌgɑːn/noun
pluralheptagons
heptagon
/ˈhɛptəˌgɑːn/
noun
pluralheptagons
Learner's definition of HEPTAGON  
[count]mathematics
: a flat shape that has seven sides and seven angles

— heptagonal

/hɛpˈtægənəl/adjective
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