Question

please solve this question

Answer 1

Let angles of triangle be 1 , 2 and 3

By linear pair

angle 1 + 100°=180°

angle 1= 80°

angle 2 + 120°= 180°

angle 2 = 60°

By angle sum property of triangle =

80°+60°+ angle 3= 180°

angle 3 = 40°