A degree, usually denoted by °, is a measurement of a plane angle in which one full rotation is [tex]360[/tex] degrees. It is not an SI unit—the SI unit of angular measure is the radian—but it is mentioned in the SI brochure as an accepted unit.
The radian, denoted by the symbol rad, is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics. The unit was formerly an SI supplementary unit and the radian is now an SI derived unit.
According to the question
[tex]1[/tex] degree[tex]=0.0174533[/tex] radian
So,
[tex]12[/tex] degree [tex]=12\times 0.0174533[/tex]
[tex]=0.20944[/tex] radian