Question

Am I right?
Gordon 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?

Supplements of congruent angles are congruent.

A linear pair of angles is supplementary.

If two angles of a triangle are congruent, the sides opposite these are congruent.

If two sides of a triangle are congruent, the angles opposite these sides are congruent.

Answer 1

i think it is "A linear pair of angles is supplementary." but im not sure

Answer 2

@Calcmathlete @zepp am I correct? if not can you please explain why.

Answer 3

@satellite73 ^

Answer 4

I would go with that

Answer 5

thanks! :)

Answer 6

1 congruent to 1
2 congruent to 2

3 supplementary to 1,2

yep :)