Given k // l, what can you conclude about these triangles? check all that apply.
a) vertical angles prove ∠1 ≅∠4
b) alternate exterior angles prove ∠5 ≅∠3
c) ∠5 and ∠3 are alternate interior angles.
d) the ratios of the corresponding angles are equivalent.
e) the triangles are similar because all corresponding angles are congruent.