The radian gets its own page in the SI section
The radian has its own page in the SI section, and the overview now gets it right: the radian and the steradian have been derived SI units since 1995.
The SI section has a new page on the radian, the SI unit of plane angle. A radian is the angle whose arc is as long as the radius, and 1 rad is 57.29578°. The page follows the pages on the newton, the hertz and the other derived units: the definition, a fact box on the history, how big a radian is, how the unit is realized and common sources of error.
Why the radian
Since 4 November there has been an angle converter. The radian is the unit most questions about angles are about, such as what a radian is and how many degrees it equals. Now the explanation and the converter sit on the same site, and the pages link to each other.
The overview is corrected
The overview of the SI called the radian and the steradian supplementary units. That class was abolished in 1995, and both have counted as derived SI units since. The section is now called Radian and Steradian and links to the new page. The list of angle units now also links to the converter.
The radian sits in the menu under SI Units, in the derived SI units group.