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Ilya [14]
3 years ago
7

Janet is trying to prove that the sum of the measures of the interior angles of a triangle is 180°.

Mathematics
2 answers:
Butoxors [25]3 years ago
7 0

Answer:

  A  Alternate interior angles of parallel lines are congruent

Step-by-step explanation:

The referenced angles (1, A), (3, C) are alternate interior angles, not corresponding or exterior. The symmetric property does not apply. The only answer choice with any applicability is the one shown above. (It is also the right choice.)

pogonyaev3 years ago
6 0

Answer:

<h2>A . Alternate interior angles of parallel lines are congruent</h2>

Step-by-step explanation:

If you observe the image, the statement that Janet wants to justify is

\angle 1 \cong \angle A

\angle 3 \cong \angle C

According to the given graph, these angles are inside parallels because DE \parallel AC by given, and these angles are at different sides of the transversals BA and BC, those position define Alternate Interior Angles, which by theorem  they are congruent.

Therefore, the right reason of such congruence is

<em> A . Alternate interior angles of parallel lines are congruent.</em>

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