Question

Two lines AB and CD intersect at O such that BC is equal and parallel to AD. Prove that the lines AB and CD bisect at O. 

Answer 1

Given that lines AB and CD intersect at O
Such that BC || ADand BC = AD ……..(1)  

We have to prove that AB and CD bisect at O. 

To prove this first we have to prove that ΔAOD ≅ ΔBOC