<Tr> <Th> Schläfli symbol </Th> <Td> () × () </Td> </Tr> <Tr> <Th> Coxeter diagram </Th> <Td> </Td> </Tr> <Tr> <Th> Symmetry group </Th> <Td> Dihedral (D), (2), (* 22), order 4 </Td> </Tr> <Tr> <Th> Dual polygon </Th> <Td> rhombus </Td> </Tr>

What is the adjacent side of a rectangle