<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> <Tr> <Th_colspan="2"> Regular hexagon </Th> </Tr>

How many straight edges does a hexagon have