Question

Jamie is writing a proof of the theorem stated below.

Theorem: The sum of interior angles of a triangle is 180°.

He first drew the figure shown below.



Which theorem will he most likely use in the proof?
Answer
Vertical angles are congruent.
Supplements of congruent angles are congruent.
Alternate interior angles formed by parallel lines and their transversal are congruent.
If two angles of a triangle are congruent, the sides opposite these are congruent.

Answer 1

The third one

Answer 2

Yup, definitely "Alternate interior angles formed by parallel lines and their transversal are congruent."

Answer 3

alright thnx guys