Question

prove that the vertically opposite angle are equal
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Answer 1

Answer:

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prove that the vertically opposite angle are equal

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In a pair of intersecting lines the vertically opposite angles are equal. It can be seen that ray \over line{OA} stands on the line \over left right arrow{CD} and according to Linear Pair Axiom, if a ray stands on a line, then the adjacent angles form a linear pair of angles.