Answer: The correction option is B, i.e., [tex]140^{\circ}[/tex].
Explanation:
To find the angle F using protector first we have to study about the protractor.
In a protractor the angles are written in two scales. The angles of outer scale is increased in clockwise direction and the the angles of inner scale are increasing in anticlockwise direction.
The reason behind it is the property of supplementary angles. The sum of angles lie on straight line is always 180 degree.
When we have to find the angle we see the inner angles or inner semi circle or the angle in anticlockwise direction.
From the given figure it is noticed that the angles F lies on [tex]40^{\circ}[/tex] and [tex]140^{\circ}[/tex].
The angle in anticlockwise direction is [tex]140^{\circ}[/tex], therefore, the correct option is B.
