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Vertical Angles are a pair of nonadjacent anglesopposite each other formed when two lines cross.Vertical angles are two angles opposite of each other. Vertical angles will also always have equal angles.
Perpendicular lines formed right angles.
Two angles that aren't adjacent but are formed by intersecting lines are called vertical angles. Their angle measures are always equal.
Sometimes
If AB is a perpendicular bisector of CD then four 90 degreee angles are formed.