#### Answer

The answer is below.

#### Work Step by Step

1. We are told r is parallel to s.
2. If r is parallel to s, any corresponding angles are congruent.
3. Angle 1 and angle 2 are corresponding angles.
4. Angle 1 is 90 degrees.
5. Thus, by the definition of being congruent, angle 2 is 90 degrees.