Question

prove that when two lines intersect each other their vertically opposite angles are equal​

Answer 1

Answer:

Let us consider the angles on the line CD. So, we get ∠COB+∠BOD=180∘. ... From the figure, we can see that the angles ∠AOC and ∠BOD are vertically opposite angles. So, we have proved that if two lines intersect each other, then the vertically opposite angles are equal.