Question

Prove: Alternate interior angles are congruent
(in paragraph form)

Answer 1

We can say that the angle 3 and the angle 6 are congruent,; angle 2 is equal to angle 3, since vertical angles are congruent, angle 2 and angle 6 are congruent, by the corresponding angle postulate.
If angle 2 and angle 6 are congruent and angle 3 and angle 2 are congruent, angle 3 and angle 6 are alternate interior angles and they are congruent by the transitive property.

Answer 2

Np :)