Step-by-step explanation:
a. given (alternate interior angles)
b. vertically opposite angles( are equal)
c. congruent angles
The Third Angle Theorem states that if two angles in one triangle are congruent to two angles in another triangle, then the third pair of angles must also congruent.
d. given (congruent pairs of sides of triangles)
e. AAA or SSS congruence.
