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ABCD is a quadrilateral in which AD = BC...

ABCD is a quadrilateral in which AD = BC and `angleDAB = angleCBA`. If `DeltaABD ~= DeltaBAC` what is the relation between `angleABD` and `angleBAC` ?

A

`angleABD=1/2 angleBAC`

B

`angleABD=angleBAC`

C

`angleABDgtangleBAC`

D

`angleABDltangleBAC`.

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MBD-Triangles-Exercise
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