<Table> <Tr> <Th_colspan="2"> Turn </Th> </Tr> <Tr> <Th> Unit of </Th> <Td> Plane angle </Td> </Tr> <Tr> <Th> Symbol </Th> <Td> tr or pla </Td> </Tr> <Tr> <Th_colspan="2"> Unit conversions </Th> </Tr> <Tr> <Td> 1 tr in...</Td> <Td>... is equal to...</Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Th> radians </Th> <Td> 6.283185307179586...rad </Td> </Tr> <Tr> <Th> radians </Th> <Td> 2π rad </Td> </Tr> <Tr> <Th> degrees </Th> <Td> 360 ° </Td> </Tr> <Tr> <Th> gradians </Th> <Td> 400 </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Turn </Th> </Tr>

The measure of an angle is a fraction of a 3/4 turn