The obtuse angle SUV can be measured anti-clockwise from the line SU to get 120°. Then, subtract this angle from 360° to find the reflex angle. The reflex angle SUV = 360° − 120° = 240°.

Many of our favorite TVs and monitors today boast displays with high refresh rates that promise smoother onscreen action and a sharper picture ... can reach a 120-Hz refresh rate.