Question

harish said that 40 and 140 are not linear pair and he made the following picture for linear pair

Answer 1

yes both are not a liner pair

liner pair anlge not the sum only 180°
but liner pair angle.
A linear pair of angles is formed when two lines intersect. Two angles are said to be linear if they are adjacent angles formed by two intersecting lines. The measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.


now focus on this line ( the major of the straight angle)

and in your question this is not a straight angle