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teachoo.com
Theorem 6.1 Class 9 - Vertically Opposite Angles are equal
Theorem 6.1 :-If two lines 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, AOC = BODand AOD= BOCProof :- From (1) and (2) AOC
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