Answer:
From the figure we get that:
1) ∡1 and ∡8 are formed by the transversal line l; also they are alternate exterior angles.
2)∡6 and ∡8 are formed by the transversal line l; also they are corresponding angles.
3)∡7 and ∡12 are formed by the transversal line d; also they are alternate interior angles.
4)∡10 and ∡11 are formed by the transversal line m; also they are consecutive interior angles.
5)∡13 and ∡1 are formed by the transversal line c; also they are consecutive exterior angles.