the side BA and DC of a quadrilateral ABCD are produced as shown.show that x+y=a+b
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Your query is incomplete. However, I am providing you the best possible link of the similar query;
https://www.meritnation.com/ask-answer/question/the-sides-ba-dc-of-quadrilateral-abcd-are-produced-to-p-qr/lines-and-angles/7918685
Regards.