Question

prove that if two lines intersect each other than the vertically opposite angles are equal​

Answer 1

Answer:

The angles a, b, c, d are vertically opposite angles...

Step-by-step explanation:

Since, 1 + 2 = 180o … (1) (linear pair)

And, 2 + 3 = 180o … (2) (linear pair)

From (1) and (2), we get

1 + 2 = 2 + 3

Or, 1 = 3

Similarly, 2 = 4

Hence proved.