∠7 and ∠8 forms a linear pair , ∠5 and ∠2 are vertical angles ; ∠7 and ∠3 are Supplementary angles .
Linear pair of angles are any two angles which are formed on a straight line . combining the ∠7 and ∠8 a linear or straight line is formed.
Vertical angles are a pair of angles formed when two lines intersect. They are Opposite each other across the point of intersection, sharing the same vertex.
The sum of the measure of Supplementary angles equal to 180 degrees. They are either adjacent to each other, meaning they share a side but not a vertex, or they form a straight line together.