Question

Find x in figure given below.

Answer 1

remember the concept of vertically opposite angle hence x=60^°

Answer 2

180-60=120 By the property that the external angle of one side is equal to the sum of opposite angles.
then, 30+y=120 y=120-30=40
by angle sum property of traingle
x+y+30=180
x+40+30=180
x+70=180
x=110