Question

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Answer 1

ABCD is a quadrilateral

In ΔABD & ΔCDB

AB = BC (given)

DB = DB (common)

∠ABD = ∠CDB (given)

∴ΔABD & ΔCDB are congruent to each other

By CPCT, we have -

AD = CB

& AB = CD (given)

Hence, the quadrilateral ABCD is a pallelogram.

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