Answer:
a || b
Explanation:
GivenL
∠A = 80°
∠C = 80°
∠A = ∠B (vertically opposite angles)
⇒ ∠B = 80°
⇒ ∠B = ∠C
∠B and ∠C are corresponding angles.
Since the corresponding angles are equal, the two lines 'a' and 'b' are parallel with line 'l' as a transversal.
a || b