Question

prove that : If two lines intersect each other then the opposite angles are congruent​

Answer 1

Answer:

Let us consider the angles on the line CD. So, we get ∠COB+∠BOD=180∘. ⇒∠COB=180∘−∠BOD ---(1). ... So, we have proved that if two lines intersect each other, then the vertically opposite angles are congrent.