Prove that vertically oppsite angles are equal
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If two lines are intersect each other, then the vertically opposite angles are equal.
Given: Two lines AB and CD intersecting at point O.
To prove: Vertically opposite angles are equal,i.e.,
angle AOC = angle BOD
and angle AOD = angle BOC
Proof: On line AB,
By linear pair,
angle AOC + angle BOC = 180° .......(1)
On line CD,
By linear pair,
angle AOD + angle AOC = 180° .......(2)
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