For example , an angle of NUMBER@1 radians would be written as `` NUMBER@1 rad '' or `` NUMBER@1 c '' -LRB- the second symbol is often mistaken for a degree : `` NUMBER@1 ° '' -RRB- .

It is shown by the symbol `` rad '' or , less often , c -LRB- for circular measure -RRB- . A `` milliradian '' is NUMBER@2 of a radian .
