Here, we want to explain why the definition given about supplementary angles that form a straight line
When we talk of supplementary angles, we are refeering to angles that add up to 180
So an angle is a supplement of the other if they add up to 180
However, coincidentally, angles on a straight line are angles that add up to 180
While all angles forming a straight line are supplementary, all supplementary angles do not form a straight line
What we are saying here is that two angles may be supplementary and may not be angles that form a staright line
The definition that is given in the question is too general to work and did not consider cases where we might have angles that are strai