ABCD is a quadrilateral in which AD = BC and ?DAB = ?CBA. Prove that ?ABD ? ?BAC.

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Balaji Puppala

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Consider ?ABD,?BAC AB=AB(common side), AD=BC(given), angle DAB=angle CBA By SAS axiom ?ABD congruent to ?BAC by congruency, corresponding angles are equal Therefore angle ABD=angle BAC
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