Theorem 8.3 : If each pair of opposite sides of a quadrilateral is equal, then it is a parallelogram.
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In `/_\ABC` and `/_\CDA`
It is given that, `AB=CD`
It is given that, `AD=BC`
`AC` is the common side .
So, by SSS condition both the triangles are congruent.
Then, by common property of common triangles we get,
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