Prove that if two lines intersect each other, vertically opposite angles are equal
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For a pair of opposite angles the following theorem, known as vertical angle theorem holds true. Theorem: In a pair of intersecting lines the vertically opposite angles are equal. Proof: Consider two lines and which intersect each other at . The two pairs of vertical angles are: i) ∠AOD and ∠COB ii) ∠AOC and ∠BOD as shown.
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