<Tr> <Th> Dual polygon </Th> <Td> Self </Td> </Tr> <Tr> <Th> Properties </Th> <Td> Convex, cyclic, equilateral, isogonal, isotoxal </Td> </Tr> <P> In geometry, a heptagon is a seven - sided polygon or 7 - gon . </P> <P> The heptagon is sometimes incorrectly referred to as the septagon, using "sept -" (an elision of septua -, a Latin - derived numerical prefix, rather than hepta -, a Greek - derived numerical prefix) together with the Greek suffix "- agon" meaning angle . </P>

What is the name of polygon with 7 sides