Question: In quadrilateral ABCD, it is given that AB = CD and BC = DA. Prove that angles ACD and CAB are the same size. N.B.

In quadrilateral ABCD, it is given that AB = CD and BC = DA. Prove that angles ACD and CAB are the same size. N.B. If a polygon has more than three vertices, the labeling convention is to place the letters around the polygon in the order that they are listed. Thus AC should be one of the diagonals of ABCD.

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