## Exam-Style Question on Geometric Proof## A mathematics exam-style question with a worked solution that can be revealed gradually |

Question id: 320. This question is similar to one that appeared on a GCSE Higher paper in 2017. The use of a calculator is not allowed.

The diagram shows a quadrilateral ABCD in which angle DAB equals angle CDA and AB = CD.

Prove that the diagonals of this quadrilateral are of equal length.

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