If the two lines form an X then each angle directly across from another is congruent or equal to that angle.
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They are angles formed when two straight lines intersect: they are on opposite sides of the point of intersection.
Adjacent angles
Angles that are pairs of opposite and congruent lines formed by intersecting lines are intersections
Equal opposite angles.
An angle is formed by the intersection of two straight lines. If the lines are perpendicular, they will form right angles.