Upgrade subject to access all content

An angle of $ \frac { 4\pi }{ 3 } $ radians is equivalent to what angle measured in degrees?

(No Calculator)

$ { 60 }^{ \circ } $

$ { 120 }^{ \circ } $

$ { 240 }^{ \circ } $

$ { 300 }^{ \circ } $