Transversal t intersects lines a and b. At the intersection with a, the angles are numbered ∠1,∠2,∠3,∠4 in clockwise order starting from the top left. At the intersection with b, they are numbered ∠5,∠6,∠7,∠8 in the same way. If ∠3=∠6, what can you conclude?
a) a⊥b
b) t∥a
c) a∥b
d) No definite relation between a and b