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Question

ABCD is a quadrilateral in which AD=BC and DAB=CBA. Prove that,
(i) ABDBAC
(ii) BD=AC
(iii) ABD=BAC

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Solution

Given:
AD=BCDAB=CBA

(i) Consider ABD and BACAB=AB (Common) DAB=CBA (Given) AD=BC (Given)By SAS congruence criteria, ABDBAC

(ii) BD=AC (By CPCT)
(iii) ABD=BAC (By CPCT)

Hence Proved.

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