Actually, It is this.
Question: Angle 1 and 4 are called ___ angles?
Answer: Supplementary
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The Vertical Angles Theorem says that a pair of vertical angles are always congruent.
Yes, a pair of intersecting lines always forms a pair of vertical angles.
you bet it can
Vertical angles occur when 2 angles are directly across from each other and are congruent.
Because they are obtuse angles!