Question

Find x in the given figure. Justify your answer.

Answer 1

X+40+60=180 (sum of exterior angles)
x+100=180
x=180-100
x=80

Answer 2

60°+40°+ angle acb=180
100°+acb=180
acb=180-100
acb=80

80+x=180(Linear pair)
x=180-80
x=100