Do you mean the two angles that are formed by two intersecting lines? If yes, they are called vertical angles and they are congruent.
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the intesection of the two sides of an angle is the angle 's?
any pair of angles that have the same relative position at each intersection where a straight line crosses two others
Yes and the angles around the point of intersection add up to 360 degrees.
If I understand the question: Either pair of opposite angles formed by the intersection of 2 lines.
a coordinate plane