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since AB// DC and AB =DC
so ABCD is a parallelogram.
In triangle ABD and triangle CDB -
i)BD=BD(COMMON)
ii)AB=CD(GIVEN)
iii)AD=BC(OPPOSITE SIDE OF A PARALLELOGRAM IS EQUAL)
THEREFORE,TRIAN. ABD IS CONGRUENT TO TRIAN. CDB
so ABCD is a parallelogram.
In triangle ABD and triangle CDB -
i)BD=BD(COMMON)
ii)AB=CD(GIVEN)
iii)AD=BC(OPPOSITE SIDE OF A PARALLELOGRAM IS EQUAL)
THEREFORE,TRIAN. ABD IS CONGRUENT TO TRIAN. CDB
hari70:
thank u
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