1.

ABCD is a quadrilateral in which AD||BC. Find b c, ,andd.​

Answer»

ANSWER:

ABCD is a quadrilateral, where AD=BC and ∠DAB=∠CBA

In △ABD and △BAC,

⇒ AD=BC [ Given ]

⇒ ∠DAB=∠CBA [ Given ]

⇒ AB=BA [ COMMON SIDE ]

∴ △ABD≅△BAC [ SAS CONGRUENCE rule ]

∴ ∠ABD=∠BAC [ CPCT ]



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