Question

Alternate interior angles are congruentTransitive property of congruenceCorresponding angles are congruentConverse of the corresponding angles postulate

Answer 1

Recall that the transitive property of congruence states that:

$If\text{ }a\cong b\text{ and a}\cong c\text{ then b}\cong c.$

Since

$\angle1\cong\angle2\text{ and }\angle1\cong\angle4$

then by the transitive property of congruence we get:

$\angle2\cong\angle4.$

Answer: Transitive property of congruence.