<P> A truncated octagon is a hexadecagon, t (8) = (16). A quasitruncated octagon, inverted as (8 / 7), is a hexadecagram: t (8 / 7) = (16 / 7). A truncated octagram (8 / 3) is a hexadecagram: t (8 / 3) = (16 / 3) and a quasitruncated octagram, inverted as (8 / 5), is a hexadecagram: t (8 / 5) = (16 / 5). </P> <Table> <Tr> <Th_colspan="5"> (show) Isogonal truncations of octagon and octagram </Th> </Tr> <Tr> <Th> Quasiregular </Th> <Th_colspan="3"> Isogonal </Th> <Th> Quasiregular </Th> </Tr> <Tr> <Td> t (8) = (16) </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> t (8 / 7) = (16 / 7) </Td> </Tr> <Tr> <Td> t (8 / 3) = (16 / 3) </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> t (8 / 5) = (16 / 5) </Td> </Tr> </Table> <Tr> <Th_colspan="5"> (show) Isogonal truncations of octagon and octagram </Th> </Tr> <Tr> <Th> Quasiregular </Th> <Th_colspan="3"> Isogonal </Th> <Th> Quasiregular </Th> </Tr>

What is the interior angle of a 16 sided polygon