Wie rechnet man -120 Grad in Bogenmaß um?

#"to convert from "color(blue)"degrees to radians"#

#color(red)(bar(ul(|color(white)(2/2)color(black)("radian measure"="degree measure "xxpi/(180))color(white)(2/2)|)))#

#"radian "=-cancel(120)^2xxpi/cancel(180)^3=-(2pi)/3#