1.

Prove that if two lines intersect, then the vertically opposite angles are equal.​

Answer»

♠Answer♠

∠COB=180∘−∠BOD ---(1). Now, let us consider the angles on the LINE AB. So, we get ∠COB+∠AOC=180∘ ---(2). ... So, we have PROVED that if two lines intersect each other, then the vertically opposite angles are EQUAL.

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