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Answer:

alternate int. <s of parallel lines

Step-by-step explanation:

We are told that lines r and s are parallel.

Lines r and s are curt by transversal line m.

Theorem:

If two parallel lines are cut by a transversal, then alternate interior angles are congruent.

Angles 2 and 11 are alternate interior angle, so they are congruent.

Answer: alternate int. <s of parallel lines
2 is congruent to 11. A way to justify this is because 2 is congruent to 3 because they are vertical angles. 3 is congruent to 11 because they are corresponding angles. Thus 2 is congruent to 11 through the transitive property.

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