Vertical angles are pairs of opposite angles formed by the intersection of two lines. Given the angles:
- m∠1 = 63°
- m∠2 = 117°
- m∠3 = 63°
- m∠4 = 117°
The vertical angle to ∠2 (which measures 117°) is the angle that is directly across from it. Among the provided angles, ∠4 also measures 117°, making it the vertical angle to ∠2.
Therefore, the correct response is: ∠4.