..A quadrilateral is a parallelogram if a pair of opposite sides is equal and parallel..
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Step-by-step explanation:
Given: ABCD is quadrilateral and AB║CD, AB=CD.
To prove: ABCD is a parallelogram
Proof: AC is a transversal and also AB║CD, therefore
∠BAC=∠DCA(Alternate angles)
In ΔADC and ΔCBA, we have
AB=CD(Given)
∠BAC=∠DCA(Alternate angles)
AC=CA(Common)
ΔADC≅ΔCBA by the SAS rule.
Hence, by CPCT, DA=BC
Thus, Both the pair of opposite sides are equal in the quadrilateral ABCD, therefore ABCD is a parallelogram.
Hence proved.
Hope thse helps u to understand my ans ^_^
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