Answer:
3. When to angles in a plane share a vertex and a side but no common interior points, they are called Adjacent angles.
4. When two lines intersect, they form two pairs of "opposite" angles called congruent angles.
3. adjacent
4. vertical
Explanation:
3. Angles that share a vertex and one side are "adjacent" angles. They may or may not form a linear pair.
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4. Angles that share a vertex and have opposite rays for sides are "vertical" angles. (Vertical angles are congruent.)
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