<Table> <Tr> <Th colspan="2"> Regular hexagon </Th> </Tr> <Tr> <Td colspan="2"> A regular hexagon </Td> </Tr> <Tr> <Th> Type </Th> <Td> Regular polygon </Td> </Tr> <Tr> <Th> Edges and vertices </Th> <Td> 6 </Td> </Tr> <Tr> <Th> Schläfli symbol </Th> <Td> ( 6 ) , t ( 3 ) </Td> </Tr> <Tr> <Th> Coxeter diagram </Th> <Td> </Td> </Tr> <Tr> <Th> Symmetry group </Th> <Td> Dihedral ( D ) , order 2 × 6 </Td> </Tr> <Tr> <Th> Internal angle ( degrees ) </Th> <Td> 120 ° </Td> </Tr> <Tr> <Th> Dual polygon </Th> <Td> Self </Td> </Tr> <Tr> <Th> Properties </Th> <Td> Convex , cyclic , equilateral , isogonal , isotoxal </Td> </Tr> </Table>
how many straight edges does a hexagon have
6