Question

please give me answer of the question

Answer 1

Take a quad. ABCD
angleA=1
angleB=2
angleC=3
angleD=4
As opp. angles of quad. are equal
1=3.....(1)
2=4.....(2)

As alternate angles are also equal
1=4.....(3)
3=2.....(4)

From (1),(2),(3) and (4)
1=2=3=4