Answer:
There are two street A and L which run parallel to each other.
Suppose the point of intersection of Boulevard N and Street L is 75°south of below their intersection.
Let their point of intersection is S.
Taking a point P and Q on opposite side of L and R and T on opposite side of Line N,
then either ∠PSR=75° or ∠ QSR=75°
Case 1. If ∠PSR=75°,
then ∠PSR + ∠PST=180°[ linear pair]
75°+ ∠PST=180°
∠PST=180°- 75°
∠PST=105°
∠QST = ∠PSR=75° [ Vertically opposite angles]
2. If ∠ Q S R =75°
∠ Q S R + ∠ Q S T=180°[linear pair]
75° +∠ Q S T=180°
∠ Q S T=180°-75°
∠ Q S T= 105°
∠Q SR = ∠P ST = 75° [ Vertically opposite angles]
