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ABCD एक चतुर्भुज है, जिसमें AD = BC और a...

ABCD एक चतुर्भुज है, जिसमें AD = BC और `angleDAB=angleCBA` है (देखिए चित्र) | सिद्ध कीजिए कि
(i) `DeltaABD~=DeltaBAC`
(ii) BD = AC
(iii) `angleABD=angleBAC`

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