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Whenever two lines intersect, they form two pairs of vertical angles. Vertical angels have a common vertex, but they are never adjacent angles. Fin, vertical angles are always congruent.

Answer with explanation:

When two lines or line segment Intersect four angles are formed.Two pair of angles forms linear pair that is sum of their angles is equal to 180°.The pair that do not form linear pair are vertical or vertically opposite angles.

  So, A Pair of vertically opposite angles are always equal to each other.

In the figure below

∠1=∠2

∠3=∠4

are vertically opposite angles.

Ver imagen Аноним

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