Trigonometry and Angle System Reference
make_system< boost::units::angle::degree_base_unit >::type unit< dimensionless_type, system > angle degree unit constant unit< plane_angle_dimension, system > const plane_angle const plane_angle
make_system< boost::units::angle::gradian_base_unit >::type unit< dimensionless_type, system > angle gradian unit constant unit< plane_angle_dimension, system > const plane_angle const plane_angle
make_system< boost::units::angle::revolution_base_unit >::type unit< dimensionless_type, system > angle revolution unit constant unit< plane_angle_dimension, system > const plane_angle const plane_angle