When two angles are opposite each other. For example in an "X" the two side openings are vertical and the bottom and top angles are vertical
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I think you mean vertical angles. Vertical angles are formed by two intersecting lines that make what looks like an X. Vertical angles are the two angles that are across from each other, either the top and bottom 2 angles or the left and right 2 angles. Vertical angles are also always congruent!
vertical angles are when you have an "x" made by intersecting lines and the angles in it are vertical angles. Opposite angles are when you have the x, the angles are on directly opposite sides. --->x<--- those are opposite of each other. therefore they are opposite angles. the arrows are pointing at them
If two angles are vertical then they are congruent.
Vertical angles can be supplementary angles if the lines are perpendicular and then both of the vertical angles would be 90 digress.
No, because by definition, vertical angles are not adjacent angles. Hope this helps