“Find the measure of angle 1 if angle CUB=78. Name the special pair of angles formed.”
[tex]\\ \rm\longmapsto <CUB=<CUS+<BUS[/tex]
[tex]\\ \rm\longmapsto <1+48=78[/tex]
[tex]\\ \rm\longmapsto <1=78-48[/tex]
[tex]\\ \rm\longmapsto <1=30[/tex]