Vertical angles are formed by two intersecting lines and are opposite each other. They have equal measures.
In this case, the angles given are:
- m∠1 = 32°
- m∠2 = 148°
- m∠3 = 32°
- m∠4 = 148°
The vertical angle to ∠2 (which measures 148°) is ∠4, as they are opposite each other.
So, the answer is: ∠4.